Uni-T UT371 Non-Contact TachometerUni T UT371 Non Contact Tachometer The Uni T UT371 non contact tachometer measures rotational speed in the range of 10 to 99,999 RPM without interfering with the operation of the device, as it uses a laser and a reflective tape. The model also offers a count function in the range of 099,999, operates at a distance of 50200 mm, and provides an accuracy of 0. 03% for the 1099 RPM range and (0. 04% + 2) in the sub ranges of 100999 RPM, 1,0009,999 RPM,