... camera,first press CAL button until 3 munites ,on screen can be display:standard type DX,through SEL,,button to adjust ... calibration X ,little different is when you press on CAL button then off,should be continuous 5 times.3.Surveying: Put the surveying ... under surveying don't change the enlargement factor,if changed,should be take a calibration again Applications:* Electrical and mechanical surface ...