How to Measure Metal Thickness Without Cutting Using an Ultrasonic Thickness Gauge Malaysia

How to Measure Metal Thickness Without Cutting Using an Ultrasonic Thickness Gauge Malaysia

Introduction

How can you measure metal thickness without cutting the material?

This is a common question among maintenance engineers, steel fabrication workshops, manufacturing factories and industrial inspection contractors in Malaysia.

Traditional measuring instruments such as vernier calipers and micrometers are useful for checking material thickness when the relevant surfaces are accessible.

However, measuring the thickness of an installed steel pipeline, storage tank wall or large metal structure can be more challenging.

In many situations, technicians cannot easily access both sides of the material.

An Ultrasonic Thickness Gauge provides a practical solution for measuring suitable metal components from one accessible side.

The Benetech GM100 Plus and Benetech GM130 Ultrasonic Thickness Gauges are portable instruments that use ultrasonic sound waves to measure material thickness.

This guide explains how to measure metal thickness without cutting, how ultrasonic testing works, which applications are suitable and how to select the right instrument for industrial maintenance in Malaysia.

1. Why Is Measuring Metal Thickness Without Cutting Important?

Industrial facilities contain many metal components that cannot be easily dismantled.

Examples include:

Installed Steel Pipelines

Industrial Storage Tanks

Machinery Housings

Fabricated Steel Structures

Metal Pressure Equipment

Cooling Water Pipes

Industrial Process Equipment

Large Steel Plates

Conventional mechanical measuring tools may require access to both sides of the component.

For installed equipment, obtaining this access may involve dismantling, cutting or other disruptive work.

Benefits of Non-Destructive Thickness Measurement

No Cutting Required

Suitable metal components can be measured without cutting through the material.

One-Side Access

Measurements can often be performed from one accessible surface.

Reduced Equipment Dismantling

Technicians may avoid unnecessary component removal.

Convenient Maintenance Inspection

Portable instruments allow measurements at selected inspection points.

Support for Corrosion Monitoring

Repeated measurements can help identify possible changes in wall thickness.

Improved Maintenance Documentation

Thickness readings can be recorded for future comparison.

However, the method must be appropriate for the material and measurement conditions.

2. What Is Non-Destructive Testing?

Non-Destructive Testing, commonly known as NDT, refers to inspection and testing methods used to evaluate materials or components without unnecessarily damaging their intended function.

Different NDT methods are used for different purposes.

Common methods include:

Ultrasonic Testing

Visual Testing

Magnetic Particle Testing

Liquid Penetrant Testing

Radiographic Testing

Eddy Current Testing

An Ultrasonic Thickness Gauge uses a specialized ultrasonic measurement method to determine material thickness.

Ultrasonic Thickness Measurement vs Ultrasonic Flaw Detection

These two applications should not be confused.

Ultrasonic Thickness Measurement

Primarily determines the thickness of suitable materials.

Ultrasonic Flaw Detection

Uses specialized ultrasonic equipment and inspection techniques to evaluate certain internal discontinuities or defects.

The Benetech GM100 Plus and GM130 are ultrasonic thickness gauges.

They should not be assumed to replace dedicated ultrasonic flaw detectors for crack detection or comprehensive weld inspection.

3. How Does an Ultrasonic Thickness Gauge Measure Metal?

An Ultrasonic Thickness Gauge uses high-frequency sound waves.

The probe transmits ultrasonic energy into the material.

When the sound wave reaches a suitable reflecting boundary, part of the ultrasonic energy returns to the probe.

The instrument calculates thickness using the measured echo travel time and the configured material sound velocity.

Basic Formula

Thickness = Sound Velocity × Echo Travel Time / 2

The division by two is necessary because the sound wave travels through the material and returns to the probe.

Why Sound Velocity Matters

Different materials transmit ultrasonic sound at different speeds.

For example:

Carbon steel

Stainless steel

Aluminium

Copper

Brass

These materials may require different ultrasonic sound velocity settings.

Incorrect sound velocity settings can produce incorrect thickness readings even when the display appears stable.

4. Ultrasonic Thickness Gauge vs Vernier Caliper vs Micrometer

Different measuring instruments serve different purposes.

Measuring InstrumentMain ApplicationAccess RequirementVernier CaliperGeneral dimensional measurementUsually requires access to relevant surfacesMicrometerPrecision dimensional measurementUsually requires access to both measuring facesUltrasonic Thickness GaugeSuitable material thickness measurementCan measure from one accessible sideUltrasonic Flaw DetectorSpecialized internal defect evaluationDepends on inspection method

When to Use a Vernier Caliper

A vernier caliper is useful for measuring accessible components such as:

Small steel plates

Metal blocks

Machined components

Accessible pipe edges

When to Use a Micrometer

A micrometer is useful when higher precision mechanical dimensional measurement is required and the component geometry permits it.

When to Use an Ultrasonic Thickness Gauge

An ultrasonic thickness gauge may be preferable when:

Only one side of the material is accessible.

The component is installed.

Cutting or dismantling is undesirable.

Routine thickness monitoring is required.

Suitable ultrasonic measurement conditions are available.

Ultrasonic thickness gauges complement mechanical measuring instruments rather than replacing them in every application.

5. Benetech GM100 Plus and GM130 Specifications

Two portable instruments available from MTM Precision Sdn Bhd Malaysia are the Benetech GM100 Plus and Benetech GM130.

SpecificationGM100 PlusGM130Steel Measurement Range1.2–300 mm1.0–300 mmWorking Frequency5 MHz5 MHzSound Velocity Range1000–9999 m/s1000–9999 m/sAutomatic CalibrationYesYesLinear Automatic CompensationYesNoCoupling Status IndicationYesYesThickness Value StorageYesYesUpper and Lower Thickness AlarmNoYesMeasurement Mode SelectionNoYesMetric / Imperial ConversionNoYes6 mm Probe CompatibilityNoYes10 mm Probe CompatibilityYesYes

Important: The specified measuring ranges are based on manufacturer steel reference conditions. Actual performance depends on the probe, material, surface condition and measurement geometry.

Benetech GM100 Plus

The GM100 Plus Ultrasonic Thickness Gauge is suitable for routine thickness measurement of compatible steel plates, metal pipelines and industrial components.

Benetech GM130

The GM130 Ultrasonic Thickness Gauge provides additional features such as upper and lower thickness alarms, measurement mode selection and compatible 6 mm and 10 mm probe options.

6. Step-by-Step Guide to Measuring Metal Thickness Without Cutting

Step 1 - Identify the Material

Determine the material type before measurement.

Common examples include:

Carbon steel

Stainless steel

Aluminium

Other compatible metals

Material identification is important because ultrasonic sound velocity varies.

Step 2 - Confirm the Expected Thickness

Estimate the expected thickness using drawings, manufacturing information or reliable reference data.

Confirm that the instrument and probe are suitable for the measurement range.

Step 3 - Prepare the Surface

Clean the measurement location.

Remove loose rust, dirt and scale that may interfere with ultrasonic coupling.

If coating removal is required, follow the approved site procedure.

Step 4 - Check the Instrument

Switch on the Benetech GM100 Plus or Benetech GM130.

Check the probe connection, battery condition and instrument settings.

Step 5 - Verify the Instrument

Use a suitable known-thickness reference according to the manufacturer's instructions.

Confirm that the instrument produces acceptable readings.

Step 6 - Set the Sound Velocity

Configure the appropriate ultrasonic sound velocity for the material.

Step 7 - Apply Ultrasonic Coupling Gel

Apply suitable ultrasonic coupling gel to the measurement surface.

The coupling agent helps transmit ultrasonic sound between the probe and material.

Step 8 - Position the Probe

Place the probe firmly against the material.

Maintain stable contact and check the coupling indication.

Step 9 - Observe the Thickness Reading

Read the displayed thickness value.

Repeat the measurement where necessary to confirm consistency.

Step 10 - Record the Result

Document:

Material type

Measurement location

Instrument model

Probe used

Measurement date

Thickness reading

Relevant surface conditions

Proper instrument verification and measurement technique are essential for reliable results.

7. Measuring Steel Plate Thickness Without Cutting

Steel plates are commonly used in:

Metal fabrication

Manufacturing

Machinery construction

Industrial equipment

Steel structures

A suitable ultrasonic thickness gauge can measure steel plate thickness from one accessible side.

Example

A technician needs to measure the thickness of an installed steel plate.

The rear surface cannot be accessed with a vernier caliper.

Using a suitable ultrasonic thickness gauge, the technician can perform the measurement from the accessible front surface.

Recommended Procedure

Confirm the steel material.

Prepare the measurement surface.

Verify the instrument.

Configure the correct sound velocity.

Apply coupling gel.

Measure and record the thickness.

Important Consideration

If the plate has coatings, surface irregularities or unusual material properties, measurement performance may be affected.

8. Measuring Pipe Wall Thickness Without Cutting

Pipe Wall Thickness Measurement is one of the most common applications of ultrasonic thickness gauges.

Industrial pipelines may carry:

Water

Compressed air

Industrial process fluids

Cooling water

Other suitable process materials

Pipe walls may experience corrosion or erosion during operation.

Why Ultrasonic Measurement Is Useful

The instrument can measure suitable pipe wall thickness from the external surface.

This may avoid cutting the pipe solely to determine its thickness.

Common Measurement Challenges

Pipe Curvature

Curved surfaces may affect probe contact.

Surface Corrosion

Rust and irregularities may interfere with ultrasonic coupling.

Protective Coatings

Paint may influence conventional ultrasonic thickness readings.

Small Pipe Diameter

Small pipes may require specialized probe geometry or measurement techniques.

Probe Selection

The GM100 Plus supports a 10 mm probe.

The GM130 supports compatible 6 mm and 10 mm probe options.

A smaller probe may be useful for certain restricted areas, but suitability must be verified for the actual pipe geometry.

9. Measuring Storage Tank Wall Thickness Without Cutting

Steel storage tanks are widely used in industrial facilities.

Typical applications include:

Water storage

Industrial process storage

Manufacturing operations

Utility systems

Suitable chemical storage equipment

Tank walls may experience corrosion due to moisture, environmental exposure or stored materials.

Ultrasonic Measurement Benefits

One-side access for suitable tank walls

Portable inspection

Thickness documentation

Support for corrosion monitoring

Reduced need for unnecessary dismantling

Important Limitation

A few ultrasonic thickness readings cannot establish the overall integrity of a storage tank.

Comprehensive tank inspection may require specialized inspection procedures and qualified personnel.

10. Can an Ultrasonic Thickness Gauge Detect Corrosion?

An ultrasonic thickness gauge can help identify possible corrosion-related wall thinning at measured locations.

For example, repeated measurements may reveal a reduction in steel thickness over time.

Example of Thickness Monitoring

Inspection DateMeasured ThicknessJanuary 20256.0 mmJanuary 20265.7 mmOctober 20265.5 mm

Illustrative values only.

The readings show a possible downward thickness trend.

However, measurement uncertainty and consistency must be considered before concluding that actual material loss has occurred.

Important Limitations

Ultrasonic thickness measurement does not automatically:

Detect every corrosion pit

Identify every internal crack

Determine the corrosion mechanism

Establish equipment safety

Replace comprehensive NDT inspection

Thickness measurement provides useful condition data but is not a complete integrity assessment.

11. Can Ultrasonic Thickness Gauges Measure Through Paint?

Many industrial steel components are protected with paint or coatings.

Conventional ultrasonic thickness measurements may be affected by these layers.

The Benetech GM100 Plus and GM130 should not be assumed to provide specialized through-coating thickness measurement.

If the application requires measuring metal substrate thickness without removing paint, a suitable through-coating instrument may be necessary.

Where permitted, coating removal at approved inspection locations may be required.

Buying Recommendation

Customers should confirm whether the material is:

Bare metal

Painted steel

Coated piping

Corroded metal

Rough fabricated material

This helps determine the appropriate instrument and measurement method.

12. Can Ultrasonic Thickness Gauges Measure Different Metals?

Ultrasonic thickness gauges may be used on various compatible materials.

Carbon Steel

Commonly used in industrial pipelines, storage tanks and fabricated equipment.

Stainless Steel

Used in manufacturing, food processing and industrial equipment.

Aluminium

Used in machinery components, fabrication and engineering applications.

Copper and Brass

Used in selected industrial and mechanical components.

Important Consideration

Different materials have different ultrasonic sound velocities and attenuation characteristics.

Material compatibility and measurement accuracy should be verified before relying on the results.

13. Common Ultrasonic Thickness Measurement Problems

Problem 1 - No Thickness Reading

Possible causes:

Insufficient coupling gel

Poor probe contact

Incorrect settings

Unsuitable material

Probe connection problems

Solution: Check the probe, prepare the surface and verify the instrument.

Problem 2 - Unstable Reading

Possible causes:

Rough surface

Curved material

Poor coupling

Inconsistent probe positioning

Solution: Improve surface preparation and repeat measurements using an appropriate procedure.

Problem 3 - Incorrect Thickness

Possible causes:

Wrong sound velocity

Calibration problems

Surface coating interference

Incorrect probe selection

Solution: Verify the instrument using a suitable known-thickness reference.

Problem 4 - Difficulty Measuring Thin Metal

Possible causes:

Thickness near the instrument limit

Probe limitations

Surface conditions

Measurement geometry

Solution: Confirm the instrument and probe capability using an appropriate reference.

Problem 5 - Different Readings at Nearby Locations

Possible causes:

Actual thickness variation

Localized corrosion

Surface condition differences

Measurement uncertainty

Solution: Repeat measurements systematically and investigate significant differences.

14. Why Calibration and Verification Matter

Reliable ultrasonic thickness measurement requires appropriate instrument verification.

Calibration

Calibration establishes the relationship between instrument readings and reference values under documented conditions.

Verification

Verification confirms whether an instrument meets specified performance requirements.

Recommended Practice

Inspect the probe and cable.

Verify the instrument using a suitable reference.

Confirm the correct sound velocity.

Use appropriate coupling gel.

Record measurement conditions.

Arrange documented calibration when required.

Built-in automatic calibration functions do not automatically replace documented laboratory calibration or traceability requirements.

15. GM100 Plus vs GM130 - Which Model Should You Choose?

Choose Benetech GM100 Plus If:

You need general metal thickness measurement.

You mainly inspect suitable steel plates.

You perform routine pipe wall thickness checks.

You do not require thickness alarm settings.

You prefer straightforward operation.

Choose Benetech GM130 If:

You need upper and lower thickness alarm settings.

You require measurement mode selection.

You want metric and imperial conversion.

You need compatible 6 mm and 10 mm probe options.

You perform varied industrial thickness inspection tasks.

Practical Recommendation

For general metal thickness measurement, the GM100 Plus may be sufficient.

For applications requiring additional screening functions and probe flexibility, consider the GM130.

The final selection should depend on the actual material, geometry and inspection requirements.

16. Industrial Applications in Malaysia

Non-Destructive Thickness Testing is relevant to many industrial sectors in Malaysia.

Manufacturing Factories

Measuring suitable machinery components, steel plates and installed metal equipment.

Steel Fabrication Workshops

Checking steel plate thickness and fabricated metal components.

Water Treatment Facilities

Measuring accessible metallic pipelines and storage equipment.

Mechanical Maintenance Contractors

Supporting routine thickness measurement and preventive maintenance.

Engineering Companies

General material thickness verification and inspection documentation.

Industrial Processing Facilities

Monitoring suitable metal components exposed to corrosion or wear.

Building Maintenance

Checking compatible metal piping and equipment where ultrasonic measurement is appropriate.

17. Ultrasonic Thickness Gauge Applications Across Malaysia

The Benetech GM100 Plus and GM130 Ultrasonic Thickness Gauges are relevant to industrial customers throughout Malaysia.

Selangor and Kuala Lumpur

Manufacturing plants, steel fabrication workshops and mechanical maintenance.

Johor

Industrial facilities, pipeline inspection and engineering contractors.

Penang and Kedah

Manufacturing operations, machinery maintenance and metal thickness inspection.

Melaka and Negeri Sembilan

Factory maintenance, industrial storage equipment and fabrication.

Perak and Pahang

Industrial processing plants, metal equipment and engineering applications.

Terengganu and Kelantan

Suitable industrial piping and equipment thickness monitoring.

Sabah and Sarawak

Industrial facilities, storage tanks and mechanical maintenance.

Customers in Perlis may also require portable ultrasonic thickness gauges for industrial inspection applications.

18. Frequently Asked Questions

Q1. How can I measure metal thickness without cutting?

A suitable ultrasonic thickness gauge can measure material thickness from one accessible side using ultrasonic sound waves.

Q2. Can an ultrasonic thickness gauge measure steel plates?

Yes. Suitable steel plates can be measured when the material, probe and measurement conditions are appropriate.

Q3. Can ultrasonic thickness gauges measure installed pipes?

Yes. Suitable metal pipe walls can often be measured from the external surface without cutting the pipe.

Q4. Is ultrasonic thickness measurement non-destructive?

Yes. It is a non-destructive measurement method when performed appropriately.

However, surface preparation or approved coating removal may still be necessary.

Q5. What is the difference between GM100 Plus and GM130?

The GM130 provides additional thickness alarms, measurement mode selection, unit conversion and compatible 6 mm probe support.

The GM100 Plus is suitable for general thickness measurement.

Q6. Can GM100 Plus measure stainless steel?

Measurement may be possible on suitable stainless steel components when the correct sound velocity and measurement conditions are used.

Q7. Can GM130 measure thin steel?

The manufacturer specifies a steel measuring range beginning at 1.0 mm, subject to the applicable probe and reference conditions.

Q8. Do ultrasonic thickness gauges require coupling gel?

Yes. Suitable ultrasonic coupling agent is normally required for reliable measurement.

Q9. Can an ultrasonic thickness gauge detect cracks?

A general ultrasonic thickness gauge should not be assumed to replace a dedicated ultrasonic flaw detector for crack detection.

Q10. Can ultrasonic thickness gauges measure through paint?

Do not assume that GM100 Plus or GM130 provides specialized through-coating thickness measurement.

Q11. Is ultrasonic thickness measurement suitable for corrosion monitoring?

Yes. Repeated measurements may help identify possible wall thinning at selected inspection locations.

Q12. Where can I buy Benetech Ultrasonic Thickness Gauges in Malaysia?

MTM Precision Sdn Bhd supplies Benetech GM100 Plus and GM130 Ultrasonic Thickness Gauges for industrial testing and maintenance applications in Malaysia.

19. Buy Benetech Ultrasonic Thickness Gauge Malaysia

Looking for a reliable Ultrasonic Thickness Gauge Supplier in Malaysia?

MTM Precision Sdn Bhd supplies industrial testing and measuring instruments for manufacturing factories, engineering contractors, maintenance departments and industrial inspection applications.

Available Models

Benetech GM100 Plus Ultrasonic Thickness Gauge

Suitable for general thickness measurement of compatible steel plates, pipelines, storage tanks and industrial metal components.

Benetech GM130 Ultrasonic Thickness Gauge

Offers additional thickness alarm settings, measurement mode selection and compatible probe options.

Need Help Choosing the Right Model?

Please provide:

Material Type

Expected Thickness Range

Pipe Diameter or Component Dimensions

Surface Condition

Measurement Application

Probe Requirements

Thickness Alarm Requirements

Calibration Requirements

Customers may send photographs of the equipment or measurement area through WhatsApp for preliminary product selection assistance.

Contact MTM Precision Sdn Bhd

MTM PRECISION SDN BHD

Showroom & Service Centre:

No. 29-1 & 29-2, Jalan Bandar 18, Pusat Bandar Puchong, 47160 Puchong, Selangor, Malaysia.

Tel: 03-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com

Website: www.mtmpre.com.my

Contact MTM Precision today for Benetech GM100 Plus and GM130 Ultrasonic Thickness Gauge enquiries, product availability and quotations in Malaysia.