The TDS-110 is a universal meter for measuring thickness of dense solids. Whilst it is offered in the context of being used to measure pipe wall thickness for calibrating transit time flow meters, it is usefull for any production or maintenance measurements. Calibration is determined by entering the velocity of sound in the measured material - then the meter will read wall thickness. There is a look up table for common materials.  Zero, calibration and two point calibrations are possible