Feature:1. Efficient Speed Measurement: The contact type rotation speed meter accurately measures speeds from 0.5 to 19999rpm, ensuring precise readings, and suitable for various applications.2. High Resolution: With a resolution of 0.1rpm (0.5999.9rpm) and 1rpm (100019999rpm), this tachometer provides accurate and reliable measurements. The 0.8s sampling time ensures efficient operation.3. Easy to Use: Designed with user convenience in mind, this speed meter features a simple interface and intuitive control. Simply point the device at the rotating object and get speed readings.4. ABS Material: Made from excellent ABS material, this rotation speed meter is durable and built to last. It operates in a wide temperature range of 050 and with a humidity range of 10%90%RH.5. Long Battery Life: Equipped with 2pcs 1.5V AAA batteries, with 1200mAh large capacity, this tachometer ensures long lasting performance, saving you the trouble of purchasing additional batteries.Specification:Item Type: Contact TachometerMaterial: ABSBattery Type: 2 x 1.5V AAA Dry Battery (included)Battery Capacity: 1200mAhMeasurement Range: 0.5-19999rpmResolution: 0.1rpm (0.5-999.9rpm), 1rpm (1000-19999rpm)Sampling Time: 0.8s (more than 60rpm)Operating Temperature: 0-50Operating Humidity: 10%-90%RHAutomatic Shutdown: No Operation for 60s.Package List:1 x Contact Tachometer2 x Batteries3 x Adapters1 x Extension Rod1 x Accessory