Digital Non-Contact and Contact Tachometer Kit – Overview This tachometer can measure the RPM or surface speed, and distance. It is used in electric power, steel, petrochemical, aviation, fan manufacturing and ventilation pipelines. The Digital Non-Contact and Contact Tachometer Kit has a USB connection and free software download. It can display real-time data sheets and data charts. Digital Non-Contact and Contact Tachometer Kit – Features Measuring distance: 50 ~ 500mm RPM non-contact: 3 ~ 99,999 RPM contact: 3 ~ 19,999 Accuracy non-contact: 0.05% ± 1dgt Accuracy contact: 0.1% ± 1dgt Surface speed: m/min, ft/min Length/Distance function: m 2000 groups memory (Timer based 00:00:00, No date and time) Ambient temperature: -10 ~ 50°C High and Low alarm limit setting Large colour LCD Min, Max, Ave and Data hold function Auto power off after 15 minutes c/w soft case, USB cable, contact adapter, surface wheel, 2 x rubber cones, reflective tape, manual and battery