We offer Digital Tachometer (rm-1500).features: * 5 Digits LCD Display* Light Reflex Measurement* Range from 10.00 to 99, 999 RPM* Measuring Distance 50 to 300 mm* Event Counter elapsed time* MaxMinHold : True Average* Auto Range RPM* Optical Measurement & Contact Measurement * Even Counter ( 099, 999) * RS-232 Interface (Optional DT- 1501 )* Contact RPM and circumferential Velocity measurement in one simple adaptor( optional RM 1502)