... select: Recession, Lay-off, Remote elevation, Offset, MLM, Area measurement. 7.Large data memory with 16,000 points.SpecificationModelDTM-112A. DTM112BDTM ... serial in RS-232/USBHeight232mmWeight6.2kg6.2kgPower supplyRechargeable battery BDC3000mAh 7.2v (Li-Battery)Battery working time8hours(Distance Measurement) 20hours(Angle Measurement ...