• Advanced microprocessor technology provides accurate and stable speed measurements • Digital Optical Tachometer: Non-contact measurement range from 0.5 to 100,000 RPM • Digital Stroboscopic Tachometer: Measurement range from 100 to 100,000 RPM with precise display • Memory function records last, maximum, and minimum values • High visibility LCD display for easy reading • Durable ABS plastic housing with ergonomic design • Portable, powered by 4 x 1.5V batteries