Features 1、Using microcomputer technology, photoelectric technology. The measuring range is 60‑40000RPM/FPM, with high accuracy and digital reading. 2、Large screen LCD display with backlight, digital control to adjust the power supply of the flash frequency, the maximum display is forty thousand, providing accurate RPM readings. 3、Advanced technologies such as anti interference technology realize non contact speed measurement, as well as detection of the state and surface defects of moving objects. 4、It has a wide range of uses and can be used to measure motors, machine parts, lathes, etc. For general industrial maintenance, production, quality control, laboratories and schools. 5、The shell is made of high quality ABS material, which is durable, strong, light in weight and long lasting. The whole is carefully designed and can be comfortably held in any hand. Specification Item Type: Tachometer Material: ABS Color: As shown in the picture Model: DT2240B Battery: 1.5V AAx4 (not included) Application: Can be used to measure motors, machine parts, lathes, etc. Measuring Range: 60-40000RPM/FPM Speed: R/min FPM: F/min When the coarse/fine adjustment range is less than 1000RPM Coarse Adjustment: 10RPM/FPM Fine Adjustment: 0.1RPM/FPM ≥1000 rpm Coarse Adjustment: 100RPM/FPM Fine Adjustment: 1RPM/FPM Accuracy Rate: 0.05% Resolution: <1000RPM: 0.1RPM/FPM ≥1000RPM: 1RPM/FPM Time Base: 10MHz quartz crystal oscillator Display: 5 digit, LCD with backlight Maximum Display: Forty thousand Package List 1 x Tachometer (Battery Not Included) 1 x Instruction Manual 1 x Case