Tachometer, RPM Accuracy +/- 0.006 Percent of Reading +/- 0.5 Digit, RPM Resolution 0.001 RPM, Maximum Contact RPM 25, 000 RPM, Minimum Contact RPM 6 RPM, Maximum Non-Contact RPM 99, 999 RPM, Minimum Non-Contact RPM 6 RPM, Maximum Non-Contact Distance 2 ft, Minimum Non-Contact Distance 1/4 in, Calibration Certificate Type NIST, Maximum Velocity Measured 12, 500 fpm, Minimum Velocity Measured 3 fpm. This item has been restricted from sale in the following state (s): []