Tachometers, ContactPhoto Contact Tachometer Dual function unit with both contact and non contact capabilities Supplied with adapters for mpm, rpm and surface speed measurements Non contact function utilizes laser light beam for improved accuracy Recalls Max Min and last values Large, easy to read display Autoranging with 0. 05% accuracy Includes battery and carrying case Measuring Range: Photo: 5 to 99,999 rpm; Contact: 5 to 19,999 rpm; Surface Speed: 0. 05 to 1999 mpm