This item adopts the microcomputer (CPU) technique and junction laser technique for one instrument which combines Photo Tach (RPM) and Contact Tach (RPM, m/min). Features: 1. Adopting advanced technologies to achieve contact or non-contact measurement of rotation speed and line speed. 2. Speed sensor with groove measures speed and length of wire, cable and rope conveniently. 3. Automatically store max value, min value and the last measurement value. 4. Contact accessory and photoelectric accessory can be converted mutually at any time to achieve multi-purpose use. 5. Automatically prompt when the voltage of power supply is lower than the specified value. 6. Large LCD screen for clear reading. 7. Wide measurement range and high resolution. Specification: Model: SM6236E Measuring Range: Photoelectric Tach: 2.5 ~ 99999RPM Contact Tach: 0.5 ~ 19999RPM Contact Line Speed: 0.05 ~ 1999.9m/min Resolution: Photoelectric Tach: 0.1RPM (2.5 ~ 999.9RPM), 1RPM(over 1000RPM) Contact Tach: 0.1RPM(0.5 ~ 999.9RPM), 1RPM(over 1,000RPM) Contact Line Speed: 0.01m/min(0.05 ~ 99.99m/min), 0.1m/min(over 100m/min) Display: 5 digits 18mm backlight LCD Accuracy: (0.05%+1 digit) Sampling Time: 0.5 sec(over 60RPM) Range Selection: Auto-Ranging Memory: Max. value, Min. value, Last value. 96 data storage Time Base: 6MHz Quartz Crystal Detecting Distance: 50 to 500mm (Laser) Battery: 3 x1.5V AA Batteries (NOT included) Power Consumption: about 50mA Color: Black Size (L*W*H): 21*7.4*3.7cm / 8.27*2.91*1.46in Weight: Approx. 436g/15.4oz Package list: 1 * Tachometer 1 * User Manual 3 * Reflective Paper 1 * Screw 4 * Tach Accessories 1 * Photoelectric Tach Head 1 * Storage Case Note: 1. Due to the difference between monitors and light effect, the pictures may not reflect the actual color of the item. 2. Please allow slight error due to manual measurement. Thanks for your understanding.