This Starrett tachometer is seriously professional gear for anyone who needs precise speed measurements! The coolest feature is the dual-mode operation - you can use it as a contact tachometer by touching the spinning surface, or as a non-contact laser tachometer from up to 25 feet away. The laser mode is perfect for measuring dangerous or hard-to-reach equipment without putting yourself at risk. It measures rotational speed (RPM), linear speed, counts, and even has a timer function for versatility. The LCD screen is clear and easy to read, with helpful indicators for when you're on target or when the battery is low. At 210g it's lightweight and portable, making it easy to carry around the shop or job site. Conforms to NIST standards too, which is important for compliance in many industries. Perfect for mechanics, engineers, maintenance technicians, or anyone working with motors, conveyor belts, fans, or any rotating machinery. The quality is exactly what you'd expect from Starrett - built to last and accurate as can be.