Tachometer, RPM Accuracy +/- 0.006 Percent, RPM Resolution 1 RPM, Maximum Contact RPM 25, 000 RPM, Minimum Contact RPM 0.1 RPM, Maximum Non-Contact RPM Not Applicable, Minimum Non-Contact RPM Not Applicable, Maximum Non-Contact Distance Not Applicable, Minimum Non-Contact Distance Not Applicable, Calibration Certificate Type NIST, Maximum Velocity Measured 12, 500 fpm, Minimum Velocity Measured 0.05 fpm. This item has been restricted from sale in the following state (s): []