TACHOMETER World’s patent, Multi-functions, one instrument combine Photo Tach.( RPM ) & Contact Tach. ( RPM, m/min., ft/min. ). Wide measuring range from 0.5 to 100,000 RPM. 0.1 RPM resolution for the measured value < 1000 RPM. High precision with 0.05% accuracy. The last value, max., value, min. value will be stored into the memory automatically & can be obtained by pressing Memory Call Button. Laser light beam for photo tachometer, long measuring distance. Large 60 x 30 mm LCD display Uses exclusive one chip Micro-Computer LSI circuit & crystal time base, offering a high accurate measurement & fast sampling time The use of durable, long lasting components, including a strong light weight ABS plastic housing assure almost maintenance free performance for many years The housing cabinet has been carefully shaped to fit comfortably in either hand Specifications: Accuracy: ± (0.05 % + 1 digit) Time Base: Quartz crystal Photo Tachometer Detecting Distance: 50 to 500 mm typically Photo Tachometer Laser Light Source: Class 2 laser diode. Red Wave length is 645mm approx. Operating Temperature: 0°C to 50°C Operating Humidity: less than 80% RH Dimensions: 215 x 65 x 38 mm Weight: 240g Accessories Included: Carrying case, reflecting tape marks (600mm), RPM cone adapter, RPM funnel adapter, surface speed test wheel & operation manual