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Measuring Techniques

How accurate is Leica DISTO™ at 0.5m, 1m … to 200m?
The measurement deviation for Leica DISTO™ devices is not directly proportional to the measured distance. Therefore the accuracy of a Leica DISTO™ remains constant until a range specified in the manual. After this range the accuracy will change by a value proportional to the distance which is also specified in the operation manual. In many cases a maximum measurement deviation will not be exceeded.
E.g. the Leica DISTO™D3 is having an accuracy of 1mm up to 10m. After this the deviation will increase by 0,025mm/m (so at 30m the accuracy will be 1,5mm). After 30m the deviation will increase by 0,1mm/m (at 100m the measurement deviation might be 8,5mm).

Please note that measurement conditions may have an influence on the accuracy. Read more about this in the FAQ for "typical accuracy". The tolerance is not proportional to the measured distance, it is the same over the entire distance. However, over long distances, additional errors of +/-5 ppm (parts per million) (+/-0.5mm/100m) come into play.