Details: Optima Scale's Wireless crane scale is a rugged, rechargeable digital crane scale offers the latest in easy-to-use digital technology. Prime OP-927 series tension scales are highly accurate and display results in a large 1-inch LCD format for quick observation. Remote controls all the functions on the indicator, letting the user turn power on/off or reset the scale. A patented electronic design creates exceptionally low power consumption allowing for up to 72 hours on continuous use. An automatic shutoff feature further extends battery life by monitoring surrounding light conditions and turning the scale off if the ambient light prevents reading the display. This digital crane scale features automatic zero tracking to ensure proper weighing results during temperature changes or dust accumulation on the load-receiving element.