Suitable for measuring the thickness of any hard material, for example, G. Steel, cast iron, aluminum, copper, , zinc, quartz glass, polyethylene, PVC, gray cast iron, ductile iron. The data storage function of up to 10 test results, even without data, does not lose data and is suitable for on-site measurement. High-precision linear compensation circuit (1% H + 0.1). Sound test speed (m / s) with 12 storage memory. Press the up or down arrow to switch between mm or m/s readings