For my first counter with altimeter function, the counter is very galley set if only one changes place and put a nlle altitude Inventory: despite the advice of SAV Sigma, explanations are enough "nebulae". As stated in the manual, it is sensitive to the weather: for precise altitude initially I majorises about 15 / 2O meters and I get a relatively precise elevation atop a neck (4 meters close). Otherwise, for the rest it's all good, as usual with Amazon:-time control and delivery within 4 days !!
