Handheld Digital Tachometer for Fast & Precise RPM Measurement Digital Tachometer Lutron DT 2234B is a high-precision digital tachometer designed for fast, non-contact RPM measurement using a focused laser beam. This advanced handheld tachometer works as a reliable rpm measuring device, offering wide measurement range, quick response, and a clear LCD display. It safely monitors motors, shafts, fans, and rotating machinery without physical contact—ideal for industrial checks, maintenance tasks, HVAC service, and equipment troubleshooting. Applications: Automobiles, Airports, Ships, Vehicles, etc