1Fast Accurate Measurement: Provides fast and accurate RPM (revolutions per min) measurements of rotating objects. 2Automatic Memory Function: Maximum value, minimum value, and the last measured value up to 96 sets of measurement data. 3Features: High accuracy (0.05%+1digital), range selection is automatic range, sampling time is 0.8m/s. 4Working Temperature: Strong ability to adapt to temperature when working, the temperature range is 0 to 50. 5Multi Mode: 5 digit super long range, multi parameter mode is optional, time base adopts 6MHz quartz oscillator. Item Type:Digital Tachometer Material: ABS Model: DT-2235B+ Battery: 1.5V 4 x AA(Not Included) Purpose: For Machine Speed Test Basic Parameters: Measuring Range: Contact TACH Surface Speed: 0.5 to 19999 RPM 0.05 to 1999.9 m/min 0.2 to 6560 ft/min Resolution: Speed Mode: 0.1 Revolutions (0.5 to 999.9 Revolutions) 1 Revolution (More Than 1000 Revolutions) Surface Speed: 0.01 m/min (0.05 to 99.99m/min) 0.1 ft/min (0.1 to 999.9 Ft/min) 0.1 m/min(over 100m/min) 1 ft/min (over 1000 ft/min) Display: 5 Digits, 18mm (0.7in LCD) Accuracy: (0.05%+1digital) Sampling Time: 0.8m/s(above 60 RPM) Range Selection: Automatic Range Time Base: 6MHz Quartz Oscillator Working Temperature: 0 to 50 1 xDigital Tachometer 4 x Speed Test Accessories 1 x User Manual Have a great time shopping!