Tachometer, RPM Accuracy +/-0.05 Percent of Reading +1 Digit, RPM Resolution 0.1 RPM, Maximum Contact RPM 19,999 RPM, Minimum Contact RPM 0.5 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 6,559.6 fpm, Minimum Velocity Measured 0.16 fpm, Includes Large Cone Adapter, Hard Carrying Case, Small Cone Adapter