this tool BARELEY works ,it does not work in freezing weather, the batteries must be removed or they die in a month, reguardless of temp. even with fresh batts it's unreliable and shuts off by it self or gives error code.i use it for measuring siding footage and building hts for staging,because thats all it's good for. i'm a pro contractor and tool nut ,and would have retured it had i not bought it at a trade show.