Electronis unit and optical head could be mounted independently In line with the necessities resulting from vital environmental situations. A couple of ft off is a large situation but for my uses I feel a couple of mm would be ok. While I do not plan on performing anything at https://mario6slb1.birderswiki.com/1958581/the_best_side_of_جهاز_قياس_مسافات_دجيتال