Wide Measurement Range & High Precision Performance: Offers an extensive measuring range: photoelectric mode (2.5-99,999 RPM), contact mode (0.5-19,999 RPM), and linear velocity (0.05-1999.9 m/min / 0.2-6,560 ft/min). Ensures accuracy of ±(0.05%n+1d) with a 1-second sampling rate for reliable results. Ergonomic Design & Construction: Made with lightweight ABS plastic, this device provides a comfortable grip to minimize hand fatigue during prolonged use. Its portable handheld design allows easy measurements on the go, making it for fieldwork and on-site maintenance. Backlit LCD Display & Convenient Memory Function: Features a backlit LCD screen for clear visibility of readings in low-light conditions. Automatically stores maximum, minimum, and last measured values for quick reference and data tracking without the need for manual recording. Versatile Applications Across Industries: for measuring RPM, frequency, surface velocity, and length across various equipment types including motors, fans, automobiles, and paper mill machinery. Suited for industrial maintenance, automotive repair, equipment calibration, and DIY projects. Service: We are very sorry for the shopping experience you have experienced. If you have any problems with the goods you received, please contact us and we will serve you 24 hours a day.