Features: One wireless palm indicator control load of 2pcs dynamometers(1T-200T) and display each dynamometer value and their SUM value, you can choose RS232 and mini-print * Name: Wireless dual Dynamometer * Model: DL-W 1t--200t * CE approved * Units:kg/Ib/n/kn/t * LCD display with backlight * Low battery warning * Three standard(LR6AA) battery, low battery warnning * wireless palm indicator, wireless frequency:2.4GHz, 433MHz, 860MHz(optional)