... weight of the instrument150g1, In daylight or reflector is not good, please use the target.2, In good ... strong,the surface of a measured object reflecting weaker or temperature difference is too large, more than 70m ... by Hongkong Air Post, EMS, UPS, fedex or DHL.Items will be checked carefully before sent out ... you have any item proplem, just send us email or message. We will do our best to slove it ...