Feature: 1. [Durable Material] The stroboscope is made of high quality ABS material, which is durable, stable in performance, and can be used for a long time. 2. [LCD Display] With large LCD backlit display, which is easy to read data in the dark, and the measurement result is accurate, to meet your various need. 3. [High Efficiency] Stroboscope adopts digital control to adjust the flash frequency, low power consumption, with speed storage, and improves the measurement efficiency. 4. [Anti Interference] Adopt photoelectric technology, anti interference, realize non contact measurement, detect the state of moving objects and surfaces defects. 5. [Compact And Portable] Non contact stroboscope tachometer is compact, easy to carry and store, widely used in industrial maintenance, production, laboratory, etc. Specification: Item Type: Stroboscope Material: ABS Product Model: DT2239B Measuring Range: 60-19,999RPM Coarse/Fine Adjustment Amplitude: <1,000RPM: coarse adjustment ±10RPM, fine adjustment ±0.1RPM ≥1,000RPM: coarse adjustment ±100RPM, fine adjustment ±1RPM Accuracy: ±0.05% Resolution: <1,000RPM: 0.1RPM ≥1,000RPM: 1RPM Battery: 4 x AAA batteries (Battery Not Included) Package List: 1 x Stroboscope (Battery Not Included) 1 x Manual 1 x Storage Box Note: Please read the manual carefully