Myzox CL-28 CL-36 Auto Level Accuracy Problems and Troubleshooting Guide Malaysia
Myzox CL-28 CL-36 Auto Level Accuracy Problems and Troubleshooting Guide Malaysia
An automatic level is a precision surveying instrument. When leveling results appear inconsistent, the problem does not always mean that the instrument itself is defective.
Tripod stability, leveling staff position, focusing, setup technique, environmental conditions and instrument adjustment can all influence field measurements.
The Myzox CL-28 and CL-36 Auto Levels are designed for professional construction surveying and civil engineering applications. Understanding common leveling problems can help operators obtain more reliable measurements and recognize when an instrument should be professionally checked.
MTM Precision Sdn. Bhd. is an authorized distributor of Myzox in Malaysia, supplying Myzox surveying instruments and accessories for professional users.
What Accuracy Does the Myzox CL Series Provide?
The two models have different specified leveling accuracy.
Myzox CL-28
28X magnification
36 mm objective aperture
0.4 m minimum focusing distance
±2.0 mm accuracy for 1 km double-run leveling
±15′ self-leveling range
360° horizontal circle
Approx. 1.3 kg weight
Myzox CL-36
36X magnification
36 mm objective aperture
0.4 m minimum focusing distance
±1.0 mm accuracy for 1 km double-run leveling
±15′ self-leveling range
360° horizontal circle
Approx. 1.3 kg weight
The CL-36 provides the higher specified leveling accuracy, but correct field procedure remains essential for both models.
Why Is My Auto Level Giving Different Readings?
If repeated measurements do not agree, check the complete measurement setup before assuming that the auto level is faulty.
Common causes include:
Unstable tripod
Leveling staff not held vertically
Incorrect focusing
Instrument not properly set up
Excessively long sighting distances
Heat shimmer
Strong vibration
Instrument movement
Recording mistakes
Instrument requiring adjustment or inspection
A systematic troubleshooting process can help identify the source of the problem.
Problem 1: Unstable Tripod
Tripod stability is one of the first things to check.
If a tripod leg gradually sinks into soft soil, the instrument position can change during measurement.
This may happen on:
Soft ground
Mud
Loose sand
Recently filled soil
Unstable construction surfaces
What Should You Do?
Set the tripod firmly on stable ground and make sure all legs are securely positioned before taking readings.
Avoid touching or leaning against the tripod while measurements are being taken.
Problem 2: Leveling Staff Is Not Vertical
A leveling staff should be held vertically.
If the staff is tilted significantly, the observed reading can be affected.
This problem can become more noticeable when taking important elevation measurements.
What Should You Do?
Make sure the staff is held vertically and use an appropriate staff bubble where required.
For critical observations, repeat the reading to confirm consistency.
Problem 3: Telescope Is Not Properly Focused
Poor focusing can make staff graduations difficult to read.
The operator should ensure that both the reticle and the leveling staff image are clearly focused.
If the eye position changes and the reticle appears to move relative to the target, parallax may still be present.
What Should You Do?
Adjust the eyepiece and focusing control carefully before recording the staff reading.
Good focusing is particularly important when working at longer observation distances.
Problem 4: Auto Level Is Outside Its Working Range
The Myzox CL-28 and CL-36 have a specified self-leveling range of ±15′.
The automatic compensating mechanism is not a substitute for proper initial setup.
What Should You Do?
Use the leveling screws and bubble to correctly set up the instrument before relying on the compensator.
If the instrument is significantly tilted, reposition or re-level it before continuing.
Problem 5: Heat and Atmospheric Conditions
Malaysia's hot outdoor conditions can affect long-distance optical observations.
When sunlight strongly heats the ground, visible air movement or heat shimmer may make the leveling staff image appear unstable.
How Can You Reduce the Effect?
Where practical:
Reduce excessively long sight distances
Avoid sighting very close to hot ground over long distances
Take repeat observations
Work during more stable atmospheric conditions when high accuracy is required
Problem 6: Backsight and Foresight Distances Are Poorly Balanced
In appropriate leveling procedures, keeping backsight and foresight distances reasonably balanced can help reduce the influence of certain systematic errors.
This becomes particularly relevant when performing more demanding leveling work.
Operators should follow the surveying procedure specified for the project.
Problem 7: Auto Level Was Dropped or Knocked
Construction sites can be demanding environments.
An auto level may be affected by:
Accidental drops
Tripod falls
Strong impacts
Rough transportation
Excessive vibration
Even if there is no obvious external damage, the instrument's adjustment may have changed.
What Should You Do?
If the instrument has experienced a significant impact, check its performance before using it for important construction measurements.
Professional inspection may be necessary if accuracy is uncertain.
Problem 8: Readings Are Consistently Different
If an instrument repeatedly produces a systematic difference, its line of sight or adjustment may require checking.
A commonly used field verification procedure for optical levels is a two-peg test.
The purpose is to assess whether the instrument's line of sight is providing acceptable leveling results.
For professional or critical work, adjustment should be carried out according to the manufacturer's procedure or by qualified personnel.
When Should an Auto Level Be Checked?
Consider checking the instrument when:
Measurements suddenly become inconsistent
The instrument has been dropped
The tripod has fallen with the instrument attached
The equipment has experienced strong vibration
Results differ significantly from another verified instrument
The instrument has been used intensively for a long period
A project requires documented accuracy verification
Regular checking can reduce the risk of discovering an instrument problem after construction work has already progressed.
CL-28 vs CL-36: Does Higher Accuracy Eliminate Measurement Errors?
No.
The CL-36 has a higher specified leveling accuracy than the CL-28, but field technique remains important.
For example, even a high-accuracy instrument cannot compensate for:
A staff being held incorrectly
An unstable tripod
Incorrect readings
Poor field procedures
Recording mistakes
Instrument specification and operator technique must work together.
How Can Contractors Improve Auto Level Accuracy?
Good practices include:
Use a stable professional tripod
Set up the instrument correctly
Keep the leveling staff vertical
Focus carefully
Avoid unnecessarily long sight distances
Repeat important observations
Maintain appropriate backsight and foresight distances
Protect the instrument during transportation
Check the instrument after impact
Arrange professional inspection when accuracy is uncertain
Frequently Asked Questions
Why is my auto level not accurate?
Possible causes include tripod movement, staff tilt, focusing problems, poor setup, atmospheric conditions or an instrument requiring adjustment.
Does an auto level need calibration?
Precision surveying instruments should be periodically checked and professionally inspected when their accuracy is uncertain or when project requirements demand verification.
Should I check an auto level after dropping it?
Yes. A significant impact can affect instrument adjustment even when there is no obvious external damage.
What is a two-peg test?
A two-peg test is a field method commonly used to check the line-of-sight performance of an optical level.
Is the CL-36 more accurate than the CL-28?
According to the stated 1 km double-run leveling specifications, the CL-36 is ±1.0 mm, while the CL-28 is ±2.0 mm.
Which model is suitable for higher-precision work?
Where the project's requirements match its specification, the CL-36 offers the higher-accuracy option together with 36X magnification.
Myzox CL-28 & CL-36 Auto Level Malaysia
MTM Precision supplies Myzox CL-28, CL-36 and professional surveying accessories in Malaysia.
As an authorized distributor of Myzox in Malaysia, we support contractors, engineers and surveyors looking for reliable equipment for construction leveling and civil engineering applications.
Contact MTM Precision
MTM Precision Sdn. Bhd.
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Website: www.mtmpre.com.my
Email: mtmpre@yahoo.com
WhatsApp: +6016-6607346
Contact MTM Precision for enquiries about the Myzox CL-28, CL-36 Auto Level, surveying equipment and professional instrument support in Malaysia.
16 Aug 2026
