MODEL : CT-500 Measurement: A. Photo Tachometer Range : 20 RPM to 75,000 RPM Distance : Operation from 50 mm to 150mm using a photo-reflective tape Light : RED visible LED light B. Contact Tachometer Range : : 20 RPM to 25,000 RPM The upper speed is limited by error caused by rubber roller slippage > Battery : : 4x1.5 V Penlite cells Accessories : Carrying Case- 1 pc. RPM Adapter (Cone) - 2 pc. RPM Adapter (Conical) - 1 pc. Surface Speed Wheel - 1 pc. (10 cm Circumference) Operation Manual - 1pc. Reflecting Tape - 1m 1.5V x 4 Pencil Cells |