Seamless steel pipe enclosure for maximum protection. Manu operation mode, calibration, saving, searching, peak hold, easy to operate. Indicator Adopts ∑ -Δ A/D conversion technology. Weighing data save protection in case of power off. Battery charger with several protection modes to extend life of rechargeable battery. Standard RS232 communication interface(optional). Portable design, indicator packed in portable carry case, easy to operate outdoor. Gathering up to data records of 99 weighings, records can be sorted, searched. Power saving mode, indicator will turn off automatically after 30minutes with no operation. With 32 channels optional, so 32 crane scales can operated independently in the same airplace without interface.