CE Compass New Digital Laser Photo Tachometer Non Contact RPM Tach Display: Large 5 digit, 18mm LCD. Test select: Automatic. Range: 2.5 to 99,999 RPM Resolution: 0.1 RPM (from 2.5 to 999.9 RPM) 1 RPM (over 1,000 RPM) Accuracy: +/-( 0.05%25 +1 digit)