Tachometer with Computer Interface, Measures Counts Contact / Noncontact Noncontact Contact RPM Range / 10 to 99,999 Noncontact RPM Range / 10 to 99,999 RPM Accuracy / +/-0.04% +/-2 Digits Speed Accuracy / +/-0.04% +/-2 Digits Working Distance / 0.65 ft Working Angle / +/-30 Degrees Light Source / Laser Display / LCD Standards / CE Compliant Includes / Batteries, Instructions, Reflecting Tape, USB Interface Cable