UNI-T UT371 Tachometer

From the shop's description

UNI-T UT371 Tachometer UT370 series non-contact tachometers measure rotating speed of shaft or disk with a point laser and reflective tape on the object being measured. These meters can output RPM or count readouts without interfering with the equipment being measured. Features: 5 digits LCD screen, RPM/count and time dual display. MAX/MIN/AVG/normal modes. Adjustable sampling rate (0.5-255s). Auto power off (cancelable). Optional (on/off) laser pointer. Clock and time setting. Data hold, low power consumption, continuous work for 40hrs. Specifications: Specifications Range UT371 RPM range: 10RPM~99RPM ±(0.03%) 100RPM~999RPM ±(0.04%＋2) 1000RPM~9999RPM ±(0.04%＋2) 10000RPM~99999RPM ±(0.04%＋2) Counts: Range: 0~99999 √ Max. input frequency: 10kHz; bandwidth: 5% Target distance: 50mm~200mm √ Features Display count: 100000 Data hold: √ Auto power off: Around 15 minutes √ Low battery indication: ≤4.8V √ MAX/MIN/AVG mode: √ General Characteristics Power: 1.5V battery (LR6) X 4 Display: 53mm x 41mm Product color: Red and grey Product net weight: 100g Product size: 184mm x 56mm x 34mm Applications: Measuring rotational speed of shafts / motors / machinery. Counting revolutions (counts mode). Monitoring speed in maintenance & quality control. Testing fans, pumps, and other rotating equipment. Package Contents: 1x English operating manual. 10x Reflective tape. 4x Batteries (1.5 V LR6 / AA). Documents: Datasheet . User Manual.