Pulse ~ echo mode (standard mode, for the general thickness measurement) Echo ~ echo method (coating mode, for no net removal of paint layer substrate thickness measurement) Range 0.8 ~ 300mm (standard mode)3 ~ 18mm (coated mode) Depend on the probe, the measured material, surface condition Units and display resolution Mm -0.01,0.1 In. -0.001,0.01 Probe Zero calibration Point calibration (for conventional thickness measurement) Two-point calibration.