Coating Thickness Meter vs Ultrasonic Thickness Gauge - Differences and Applications Malaysia

Coating Thickness Meter vs Ultrasonic Thickness Gauge - Differences and Applications Malaysia

Introduction

Choosing between a Coating Thickness Meter and an Ultrasonic Thickness Gauge is an important decision for industrial inspection, manufacturing quality control and maintenance applications in Malaysia.

Although both instruments measure thickness, they are designed for different purposes.

A coating thickness meter measures the thickness of suitable paint, powder coating or protective coatings applied to a substrate.

An ultrasonic thickness gauge measures the thickness of suitable solid materials, commonly including metal walls, plates and pipes.

Confusing these two instruments can result in purchasing equipment that does not meet the actual inspection requirements.

For example, a steel fabrication company may need to verify protective paint thickness after coating application.

A factory maintenance team may instead need to measure the remaining wall thickness of a steel pipe affected by corrosion.

These applications require different measurement technologies.

The Landtek CM-8826FN Coating Thickness Meter supports Fe magnetic induction and NFe eddy current measurement methods for compatible coatings on suitable metallic substrates.

An appropriate ultrasonic thickness gauge uses sound waves to measure material thickness.

This guide explains the differences between the two technologies, their industrial applications, measurement limitations and how to choose the correct instrument for Malaysian industrial inspection.

1. What Is a Coating Thickness Meter?

A coating thickness meter, also called a paint thickness gauge or dry film thickness meter, measures the thickness of suitable coatings applied to a substrate.

Common coating types include:

Industrial paint

Powder coating

Protective finishing

Suitable epoxy coatings

Decorative coatings

Other compatible coating systems

Common Applications

Steel Fabrication

Measuring protective paint thickness on fabricated steel components.

Powder Coating

Checking cured powder coating thickness on suitable steel and aluminium products.

Automotive Manufacturing

Inspecting compatible paint coatings on metallic automotive components.

Industrial Machinery

Measuring protective coatings on steel frames and aluminium housings.

Quality Control

Verifying coating thickness against specified requirements.

Important Limitation

A standard Fe/NFe coating thickness meter does not measure the remaining wall thickness of a steel pipe or plate.

It measures the compatible coating above the metallic substrate.

2. What Is an Ultrasonic Thickness Gauge?

An Ultrasonic Thickness Gauge uses ultrasonic sound waves to measure the thickness of suitable materials.

In many industrial applications, the instrument sends an ultrasonic pulse into the material and measures the time required for an echo to return.

The instrument calculates thickness using the relevant sound velocity.

Common Applications

Steel pipe wall thickness measurement

Metal plate thickness inspection

Industrial tank wall thickness measurement

Corrosion monitoring

Machinery component thickness inspection

Maintenance inspection of suitable metallic structures

Typical Industrial Users

Factory maintenance engineers

NDT technicians

Mechanical engineers

Inspection contractors

Plant maintenance departments

Industrial equipment maintenance teams

Important Limitation

A conventional ultrasonic metal thickness gauge is not automatically suitable for measuring thin paint or powder coating layers.

Specialised ultrasonic coating thickness instruments exist, but they are different from standard ultrasonic metal wall thickness gauges.

3. Coating Thickness Meter vs Ultrasonic Thickness Gauge

The following comparison explains the main differences.

FeatureCoating Thickness MeterUltrasonic Thickness GaugeMain PurposeMeasure Coating ThicknessMeasure Material ThicknessTypical MeasurementPaint or Powder CoatingSteel or Metal WallMeasurement PrincipleMagnetic Induction / Eddy CurrentUltrasonic Sound WavesTypical ApplicationCoating Quality ControlCorrosion and Wall ThicknessSuitable SubstrateDepends on Probe MethodDepends on Material and GaugeCommon IndustryCoating / FabricationMaintenance / NDTExample InstrumentLandtek CM-8826FNSuitable Ultrasonic Thickness Gauge

Main Difference

Coating Thickness Meter = Thickness of the Coating

Ultrasonic Thickness Gauge = Thickness of the Underlying Material

This distinction is essential when selecting an instrument.

4. How Does the Landtek CM-8826FN Work?

The Landtek CM-8826FN supports two measurement principles.

Fe - Magnetic Induction

Used for suitable non-magnetic coatings on ferromagnetic substrates.

Examples include:

Paint on carbon steel

Powder coating on steel

Protective coatings on steel machinery

Coated fabricated steel components

NFe - Eddy Current

Used for suitable electrically non-conductive coatings on non-ferrous conductive substrates.

Examples include:

Paint on aluminium

Powder coating on aluminium

Suitable protective coatings on aluminium panels

Why Dual Fe/NFe Capability Matters

A manufacturing company may inspect both steel and aluminium components.

The CM-8826FN can support compatible coating thickness measurement on both substrate categories.

However, the instrument does not measure the remaining metal wall thickness beneath the coating.

5. How Does an Ultrasonic Thickness Gauge Work?

An ultrasonic thickness gauge measures material thickness using sound waves.

In a conventional pulse-echo measurement:

The probe sends an ultrasonic pulse into the material.

The sound travels through the material.

The pulse reflects from an interface, commonly the back wall.

The instrument measures the travel time.

Thickness is calculated using the appropriate sound velocity.

Basic Formula

Thickness = Sound Velocity × Round-Trip Travel Time / 2

Important Measurement Considerations

Accurate ultrasonic thickness measurement depends on:

Correct sound velocity

Suitable probe selection

Appropriate coupling

Surface condition

Material properties

Instrument calibration

Measurement technique

For corroded or coated components, specialised probes or measurement modes may be necessary.

6. Example 1 - Measuring Paint Thickness on Steel

A steel fabrication company applies protective paint to a steel component.

The customer requires coating thickness inspection.

Correct Instrument

Coating Thickness Meter

For suitable non-magnetic coatings on ferromagnetic steel, the Fe measurement method is appropriate.

Example Application

Component: Painted Steel Bracket

Measurement Objective: Dry Film Thickness

Instrument Type: Fe Coating Thickness Meter

Suitable Example: Landtek CM-8826FN

Important Reminder

The instrument measures the compatible coating thickness, not the steel bracket thickness.

7. Example 2 - Measuring Steel Pipe Wall Thickness

A factory maintenance team needs to inspect a steel pipe for possible wall loss.

The inspection objective is to determine the remaining pipe wall thickness.

Correct Instrument

Ultrasonic Thickness Gauge

Example Application

Component: Industrial Steel Pipe

Measurement Objective: Remaining Wall Thickness

Instrument Type: Suitable Ultrasonic Thickness Gauge

Important Reminder

The Landtek CM-8826FN is not intended to measure remaining steel pipe wall thickness.

A suitable ultrasonic thickness gauge or another appropriate inspection method is required.

8. Example 3 - Measuring Powder Coating on Aluminium

A manufacturer produces powder-coated aluminium housings.

The quality control team needs to verify coating thickness.

Correct Instrument

NFe Coating Thickness Meter

Example Application

Component: Powder-Coated Aluminium Housing

Measurement Objective: Coating Thickness

Instrument Type: Eddy Current Coating Thickness Meter

Suitable Example: Landtek CM-8826FN

Important Reminder

The coating must be compatible with the NFe measurement method.

Substrate thickness, conductivity and geometry can affect the results.

9. Example 4 - Corrosion Inspection on Industrial Tanks

An industrial maintenance contractor needs to inspect the remaining wall thickness of a metal tank.

Correct Instrument

Suitable Ultrasonic Thickness Gauge

Why?

Corrosion may reduce the thickness of the tank wall.

A coating thickness meter cannot determine the remaining metal wall thickness.

Important Considerations

The inspection procedure should account for:

Tank material

Surface condition

Coating condition

Corrosion geometry

Required accuracy

Applicable inspection standard

Some ultrasonic thickness gauges support measurement through suitable coatings using specialised modes.

However, this capability must be confirmed for the specific instrument and application.

10. Can an Ultrasonic Thickness Gauge Measure Through Paint?

Some ultrasonic thickness gauges can measure metal thickness through suitable coatings.

However, this depends on the instrument's design and measurement mode.

Conventional Ultrasonic Measurement

A conventional gauge may require coating removal or another approved surface preparation procedure.

Echo-to-Echo Measurement

Certain ultrasonic gauges use echo-to-echo measurement to reduce the influence of suitable surface coatings when measuring metal thickness.

Important Limitations

Echo-to-echo performance depends on:

Instrument capability

Probe design

Coating properties

Material thickness

Surface condition

Measurement procedure

Do not assume that every ultrasonic thickness gauge can measure through paint.

The exact instrument specifications must be confirmed.

11. Can a Coating Thickness Meter Detect Corrosion?

A coating thickness meter measures coating thickness.

It does not directly measure corrosion depth or remaining metal wall thickness.

What It Can Do

A suitable coating thickness meter can help inspect protective coating thickness.

What It Cannot Reliably Determine

Remaining steel wall thickness

Hidden corrosion beneath intact coatings

Internal pipe corrosion

Metal loss caused by corrosion

Corrosion rate

Coating adhesion strength

Recommended Inspection Approach

For industrial maintenance, different instruments may be used together.

Coating Thickness Meter

Inspect protective coating thickness.

Ultrasonic Thickness Gauge

Measure remaining metal wall thickness where suitable.

Visual Inspection

Identify visible coating damage or corrosion.

Other NDT Methods

Investigate additional defects when required.

A complete corrosion assessment may require more than one inspection method.

12. Why Factory Maintenance Teams May Need Both Instruments

Industrial maintenance teams may inspect both protective coatings and underlying metal structures.

For example, a factory may have:

Painted steel machinery

Industrial piping

Storage tanks

Steel platforms

Coated equipment housings

Coating Thickness Inspection

Checks whether suitable protective coatings meet the specified thickness requirements.

Ultrasonic Thickness Inspection

Checks the thickness of suitable metal components.

Combined Inspection Example

Inspection ObjectiveInstrumentProtective Paint DFTCoating Thickness MeterSteel Pipe Wall ThicknessUltrasonic Thickness GaugePowder Coating on AluminiumNFe Coating Thickness MeterTank Wall ThicknessUltrasonic Thickness GaugePainted Steel MachineryFe Coating Thickness Meter

Using the correct instrument for each task helps improve inspection reliability.

13. Coating Thickness vs Material Thickness Units

Both instruments may display thickness in millimetres or micrometres, depending on their design and measurement range.

Coating Thickness

Commonly expressed in:

Micrometres (µm)

Mils

Material Thickness

Commonly expressed in:

Millimetres (mm)

Inches

Unit Conversion

1 mm = 1,000 µm

1 mil = 25.4 µm

Example

A coating thickness of 100 µm is equivalent to:

0.1 mm

However, the fact that two instruments use related units does not mean they measure the same physical quantity.

14. Common Mistakes When Choosing Thickness Measurement Equipment

Mistake 1 - Buying a Coating Thickness Meter for Pipe Wall Inspection

A coating thickness meter cannot determine remaining steel pipe wall thickness.

Solution: Use a suitable ultrasonic thickness gauge.

Mistake 2 - Buying a Standard Ultrasonic Gauge for Powder Coating QC

A conventional ultrasonic metal thickness gauge is not automatically suitable for thin powder coating measurement.

Solution: Select a compatible coating thickness meter.

Mistake 3 - Ignoring the Substrate Material

Steel and aluminium may require different coating thickness measurement methods.

Solution: Confirm Fe or NFe requirements.

Mistake 4 - Assuming Every Ultrasonic Gauge Measures Through Paint

Through-coating measurement depends on instrument capability.

Solution: Confirm the specific gauge's measurement modes.

Mistake 5 - Assuming Coating Thickness Indicates Corrosion Severity

Coating thickness alone does not establish the condition of the underlying metal.

Solution: Use an appropriate corrosion inspection method.

Mistake 6 - Ignoring Calibration Requirements

Different measurement technologies require different calibration and verification procedures.

Solution: Follow the manufacturer's instructions and applicable inspection standards.

15. How to Choose the Correct Thickness Gauge

Before purchasing an instrument, answer the following questions.

Question 1 - What Do You Need to Measure?

Paint or Coating Thickness?

Consider a suitable coating thickness meter.

Metal Wall Thickness?

Consider a suitable ultrasonic thickness gauge.

Question 2 - What Is the Material?

Identify whether the substrate is steel, aluminium, plastic or another material.

Question 3 - What Is the Expected Thickness?

Confirm the required measurement range.

Question 4 - What Accuracy Is Required?

Review the manufacturer's specifications.

Question 5 - What Is the Surface Condition?

Consider roughness, curvature, coating and accessibility.

Question 6 - Is Formal Calibration Required?

Confirm customer and quality management requirements.

Question 7 - Which Inspection Standard Applies?

Review the relevant inspection procedure.

Question 8 - Is the Instrument Suitable for the Actual Application?

Confirm the instrument's capabilities before purchase.

16. Relevant Standards for Coating Thickness Measurement

Several recognised standards may be relevant to coating thickness inspection.

ISO 2808

Paints and varnishes - Determination of film thickness.

ISO 2178

Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method.

ISO 2360

Non-conductive coatings on non-magnetic electrically conductive basis materials - Measurement of coating thickness - Amplitude-sensitive eddy-current method.

ASTM D7091

Standard Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals.

These standards are relevant to appropriate coating thickness measurement applications.

17. Relevant Standards for Ultrasonic Thickness Measurement

Ultrasonic thickness inspection may involve different standards.

ASTM E797/E797M

Standard Practice for Measuring Thickness by Manual Ultrasonic Pulse-Echo Contact Method.

This standard is relevant to manual ultrasonic pulse-echo thickness measurement.

Other Industry Requirements

Additional standards may apply depending on:

Equipment type

Material

Industry

Inspection objective

Customer requirements

Regulatory obligations

Important: The correct standard must be selected for the specific inspection application.

Using an instrument does not automatically establish compliance with a standard.

18. Industrial Applications in Malaysia

Selangor and Kuala Lumpur

Factory maintenance, steel fabrication, manufacturing quality control and industrial inspection.

Johor

Industrial manufacturing, piping inspection, metal fabrication and protective coating applications.

Penang and Kedah

Precision manufacturing, equipment maintenance and coated component inspection.

Melaka and Negeri Sembilan

Automotive component manufacturing, machinery inspection and industrial quality control.

Perak and Pahang

Steel fabrication, industrial maintenance and protective coating inspection.

Kelantan, Terengganu and Perlis

Engineering workshops, industrial equipment maintenance and fabrication inspection.

Sabah and Sarawak

Industrial infrastructure, machinery maintenance, piping and protective coating inspection.

MTM Precision welcomes enquiries from customers throughout Malaysia.

19. Frequently Asked Questions

Q1. What is the main difference between a coating thickness meter and an ultrasonic thickness gauge?

A coating thickness meter measures suitable coatings, while an ultrasonic thickness gauge measures the thickness of suitable solid materials.

Q2. Can the Landtek CM-8826FN measure steel pipe wall thickness?

No. It measures compatible coating thickness, not remaining metal wall thickness.

Q3. Can the CM-8826FN measure paint thickness on steel?

Yes. The Fe function can measure suitable non-magnetic coatings on ferromagnetic steel.

Q4. Can the CM-8826FN measure powder coating on aluminium?

Yes. The NFe function can measure suitable non-conductive coatings on compatible aluminium substrates.

Q5. Can an ultrasonic thickness gauge measure corrosion?

A suitable ultrasonic thickness gauge can measure remaining material thickness and support corrosion assessment.

It does not independently identify every type of corrosion damage.

Q6. Can an ultrasonic thickness gauge measure through paint?

Some models can, depending on their measurement modes and the application.

Q7. Can a coating thickness meter detect hidden corrosion?

No. Coating thickness alone cannot reliably determine hidden corrosion beneath intact coatings.

Q8. Which instrument should I use for powder coating inspection?

A suitable coating thickness meter is generally appropriate for compatible powder coatings on metallic substrates.

Q9. Which instrument should I use for steel tank wall thickness?

A suitable ultrasonic thickness gauge is commonly used, subject to the material and inspection requirements.

Q10. Can one instrument perform both functions?

Some specialised systems support multiple measurement functions, but standard Fe/NFe coating thickness meters and conventional ultrasonic metal thickness gauges are different instruments.

Q11. Do both instruments require calibration?

Yes. Appropriate calibration and verification procedures are important for reliable measurement.

Q12. Where can I enquire about coating and ultrasonic thickness gauges in Malaysia?

Contact MTM Precision Sdn. Bhd. for instrument selection, technical enquiries, quotation and availability.

20. Conclusion

Understanding the difference between a Coating Thickness Meter and an Ultrasonic Thickness Gauge is essential for selecting the correct industrial inspection instrument.

A coating thickness meter measures suitable paint, powder coating and protective coatings.

An ultrasonic thickness gauge measures the thickness of suitable materials, commonly including metal walls and plates.

The Landtek CM-8826FN Coating Thickness Meter supports Fe magnetic induction and NFe eddy current measurement methods for compatible coatings on steel and aluminium.

It is relevant to applications such as:

Steel fabrication coating inspection

Powder coating quality control

Automotive paint thickness measurement

Industrial machinery protective coating inspection

Manufacturing quality assurance

For applications involving pipe wall thickness, tank wall thickness or corrosion-related metal loss, a suitable ultrasonic thickness gauge or another appropriate inspection method is required.

Selecting the correct instrument helps Malaysian manufacturers, maintenance engineers and inspection contractors obtain more meaningful measurements and avoid unnecessary purchasing mistakes.

Contact MTM Precision Malaysia

Looking for a Coating Thickness Meter or Ultrasonic Thickness Gauge in Malaysia?

MTM Precision supplies industrial measuring and testing instruments for steel fabrication, industrial maintenance, manufacturing quality control, coating inspection and NDT applications.

For Landtek CM-8826FN product selection, ultrasonic thickness gauge enquiries, technical advice, quotation and availability, contact:

MTM Precision Sdn. Bhd. (744811-A)

Telephone: +603-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com / enquiry@mtmpre.com.my

Website: www.mtmpre.com.my

Showroom & Service Centre:

No. 29-1 & 29-2, Jalan Bandar 18,

Pusat Bandar Puchong,

47160 Puchong, Selangor, Malaysia.

Business Hours: Monday to Friday, 9:00 AM - 6:00 PM.

We welcome enquiries from Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kedah, Kelantan, Terengganu, Perlis, Sabah and Sarawak.

Send us a photo of your component, material, inspection objective or measurement requirements through WhatsApp. Our team can assist with selecting a suitable thickness measurement instrument.

MTM Precision - Your Industrial Measuring and Testing Instrument Supplier in Malaysia.