This combination of knowledge and skill is unsurpassed in the field of rotational speed indication and control. In terms of speed measurement, high-precision optical approaches have replaced mechanical methods. A Tachometer with HourMeter (F33834) is built to endure a long time and provide you with trouble-free usage and the whole body is completely waterproof. We only use the best materials to provide a once-in-a-lifetime experience for the designer and the end-user. The Tachometer with HourMeter (F33834) features an adjustment potentiometer for accurate corrections and perimeter lights for easy visibility day and night. Also, it has a fixed indicator of rotational speed and monitoring. Key Features: Best-Selling Product Good quality at an affordable price Excellent anti-fogging function and a two-piece pointer. Doomed glass lens Better visibility in dim light Stainless steel bezel, hand-polished Waterproof Tachometer display Perimeter-lighted white dial with black graphics An easily readable display Easy installation Specifications: SKU: F33834 Weight: 0.68 LBS Size: 4 Indicating range:4000 RPM (Diesel) (Mech Takeoff & var ratio alt)