... )offset,Cr(red) offset,cursor,vertical,horizontal,negativePower supply5V DC Allow 10% deviationWorking current400mAPower2WSize50*50*90(mm)Surveying operation: ... paralla line between distance equal to calibration length,and press CAL button,on the left screen can show the calibration OK ... into Y axle calibration£¬same with calibration X ,little different is when you press on CAL button then off,should ...