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How to Use an Ultrasonic Gauge

How to Use an Ultrasonic Gauge

An ultrasonic thickness gauge is a handheld device used to measure the thickness of various materials, such as metal, plastic, and glass, by utilizing ultrasonic waves. It is commonly used in industries such as manufacturing, construction, and maintenance.

Measuring the thickness of materials is crucial for ensuring structural integrity, quality control, and safety. By accurately determining the thickness, professionals can identify potential weaknesses, detect corrosion, and prevent failures or accidents.


Step-by-Step Guide to Using an Ultrasonic Thickness Gauge

Step 1: Prepare the Gauge

Before using the ultrasonic thickness gauge, ensure that it is properly calibrated and in good working condition. Check the battery level and make sure the probe is clean and free from any debris. At this point, you also need to calibrate the gauge using the probe and calibrated disc provided.

Insert the probe into the gauge. There are 2 holes at the top of the gauge for you to insert the wires.

Press the [CAL/MENU] button till you , set the machine to [CAL].
Place the probe on the disc at the bottom of the gauge with some couplant. The couplant creates an air-free environment for the sound wave to pass through.

The gauge will quickly register 3.00mm (the thickness of the calibrated disc) . The Velocity is also set to 5900 (the sound velocity for steel in this particular case)


Step 2: Select the Material and Probe

Identify the material you want to measure and choose the appropriate probe for accurate results. Different materials require different probe frequencies, so consult the gauge's user manual or guidelines for the correct selection.

If you are measuring steel, there is no need to adjust the Velocity. However, if you are measuring other materials, refer to the manual to see what the speed is. You can adjust the sound speed by going to the [VEL] setting by pressing [CAL/MENU]


Step 3: Apply Couplant

Apply a thin layer of couplant, such as ultrasound gel or oil, to the surface of the material. Couplant helps to improve the transmission of ultrasonic waves and ensures accurate measurements. The ultrasonic gauge works by sending the wave till there is a change in velocity and therefore it can tell the thickness based on how fast the wave returns to the probe.

Step 4: Position the Probe

Place the probe perpendicular to the surface of the material. Ensure that it makes full contact with the couplant layer. Hold the probe steady and avoid applying excessive pressure.

Step 5: Take the Measurement

Press the measurement button or trigger to send ultrasonic waves into the material. The gauge will calculate the thickness based on the time it takes for the waves to travel through the material and return to the probe. The measurement will be displayed on the gauge's screen.

Step 6: Repeat and Record

If necessary, take multiple measurements at different locations on the material to ensure accuracy. Record the measurements and any relevant information for future reference or analysis.

Benefits of Using an Ultrasonic Thickness Gauge

Using an ultrasonic thickness gauge offers several advantages:

  • Non-destructive testing: The gauge allows for non-destructive measurement, meaning it does not damage or alter the material being tested.
  • Quick and accurate: Ultrasonic thickness gauges provide fast and precise measurements, saving time and reducing human error.
  • Portability: These gauges are compact and handheld, making them easy to carry and use in various locations.
  • Versatility: They can be used on a wide range of materials, including metals, plastics, ceramics, and composites.
  • Cost-effective: Regular thickness measurements can help identify potential issues early on, preventing costly repairs or replacements.


An ultrasonic thickness gauge is a valuable tool for professionals in industries where material thickness is critical. By following the step-by-step guide and using the gauge correctly, you can ensure accurate measurements and maintain the integrity and safety of your materials and structures.

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