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 (0.5‑999.9rpm) and 1rpm (1000‑19999rpm), 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 0‑50℃ 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 Tachometer Material: ABS Battery Type: 2 x 1.5V AAA Dry Battery (included) Battery Capacity: 1200mAh Measurement Range: 0.5-19999rpm Resolution: 0.1rpm (0.5-999.9rpm), 1rpm (1000-19999rpm) Sampling Time: 0.8s (more than 60rpm) Operating Temperature: 0-50℃ Operating Humidity: 10%-90%RH Automatic Shutdown: No Operation for 60s. Package List: 1 x Contact Tachometer 2 x Batteries 3 x Adapters 1 x Extension Rod 1 x Accessory