Contact And Non-Contact Tachometer, Range: Surface Speed (Contact): 0.1 - 1999 M MINT, 0.4 - 6550 FT MINT, Rpm Range: Rotation (Non-Contact): 1 - 99999 RPM: Rotation (Contact): 19 - 19999 RPM, Accuracy: Plus- Minus (0.02 PCT V Reading Plus- Minus1 Digit), Working Distance: 600 MM Maximum (Optical), Parts Included: 6 Adapters, Carrying Case, Reflective Tapes, Batteries And User Manual, Measuring Units: M, FT, IN, Dimensions: 175 MM Length X 60 MM Width X 28 MM Height, Battery: (2) AA1.5 V LR6 (Alakaline) Or Rechargeable, Operating Temperature: 0 - 50 DEG C, CE Certified