Tachometer, RPM Accuracy +/- 0.006 Percent, RPM Resolution 1 RPM, Maximum Contact RPM 25, 000 RPM, Minimum Contact RPM 0.8 RPM, Maximum Non-Contact RPM 99, 999 RPM, Minimum Non-Contact RPM 6 RPM, Maximum Non-Contact Distance 20 ft, Minimum Non-Contact Distance 1 in, Calibration Certificate Type NIST, Maximum Velocity Measured 12, 500 fpm, Minimum Velocity Measured 0.4 fpm. This item has been restricted from sale in the following state (s): []