Calibration; Storage - Elcometer 204 Operating Instructions Manual

5 CALIBRATION

The Elcometer 204 is a fixed velocity gauge setup for measuring 4340 mild carbon steel. Therefore, the
Elcometer 204 is pre-calibrated for this specific material and cannot be calibrated for any other material
types. The velocity of sound in mild carbon steel is 5920 meters/second (0.2330 inches/microsecond).
However, because the material velocities of steel are relatively close in value from one type to the next,
different grades are still able to be measured within an accuracy range of approximately ±2% of reading or
±0.5 mm (±0.02"). The accuracy will be dependent on the grade, granularity, and surface condition of the
steel. However, it is not recommended that the Elcometer 204 be used to measure any materials other than
steel. If greater accuracy and calibration are needed, please consider some of the other models in our
product line that will be suitable for your requirements.

6 STORAGE

Your gauge has a Liquid Crystal Display. If the display is heated above 50° C (120°F) it may be
damaged. This can happen if the gauge is left in a car parked in strong sunlight.
Always store the gauge in its case when it is not being used.
If the gauge is to remain unused for long periods of time, remove the batteries and store them separately.
This will prevent damage to the gauge in the event of malfunction of the batteries.
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