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DT-2234A Digital Laser Photo Tachometer Meter Non Contact Description: Display: five 31mm word superb large LCD screen Test range: 2.5RPM ~ 99,999 RPM (r / min) Resolution force: 0.1RPM (revolutions / minute) (2.5 999.9RPM) 1RPM (rev / min) (1000RPM) Measurement Accuracy: ± (0.05% 1 words) Sampling time: 0.8 seconds (60RPM above) Effective measuring distance: 50mm to 200mm (LED light source) Time Base: 6MHz quartz crystal oscillator Range selection: automatic switching Power supply: 3 × 1.5V UM-3 battery Power consumption: about 35mA Instrument Dimensions: 160 × 76 × 40mm Automatic memory maximum, minimum, last measured value Color: iron gray