6236P Intelligent Digital Tachometer High Accuracy Handheld Tachometer Multifunctional Speed Measuring Instrument Item Type: Digital Tachometer Material: Plastic Product Model: 6236P Display: 5 digit LCD Accuracy: ± (0.05% + 5) Range Selection: Automatic range Effective Distance: Approx. 50-500mm / 1.97-19.69in Product Size: Approx. 190 x 70 x 35 mm / 7.5 x 2.8 x 1.4 in Power Supply: 1 x 9V 6F22 battery (Battery Not Included) Power Consumption: Less than 40mA Measuring Range: 10-99999 RPM photoelectric speed 1.0-19999 RPM for contact rotation speed 1.00-1999.9 M/min for contact line speed Resolution: Photoelectric Rotation Speed: 0.1rpm (2.5-999.99RPM) 1RPM (above 1000rpm) Contact Rotation Speed: 0.1rpm (0.5-999.99RPM) 1RPM (above 1000rpm) Contact Line Speed: 0.01m/min (0.05-99.999m/min) 0.1M/min (above 100 meters/min)