LotFancy Laser Photo Digital Tachometer NonContact Tachometer RPM Tach Meter-2.5-99,999 (DT2234A) Measures the rotational speed with a visible red light beam from a powerful LED High intensity class II laser measures from 2.5 - 99,999 RPM Extra large 5-digit LCD display, high accuracy of +/- 0.05%, distance: 50 to 500 mm/ 2 to 20 inches Auto zero adjustment, stores last, minimum, and maximum readings 1-Year Warranty: Money-back satisfaction guarantee