laser distance meter 40m 1,good quality meter with range 40m 2,hand held tool , simple use 3,multi function laser distance meter 40mPD-54 Technical Data ... Reading1mmLaser ClassClass IILaser Type635nm, < 1mWDiameter of Laser Spot(at distance)6mm at 10m; 30mm at 40mAuto Power-off180sIlluminationAvailableContinuous Measurement,Pythagoras ... C~70°C (Storage)0°C~ 40°C (Operation) laser distance meter 40m