The rangefinder may be on the wrong measurement unit, so you may not be getting the correct measurement. The Series 3 Max rangefinder can measure in meters and yards. By holding the ‘Mode’ button for 3 seconds, you can toggle between the 2 units. By switching to the correct unit of measurement you want, you can get accurate readings. Suppose the unit of measurement is set properly, but still, the measurements are not correct. In that case, it may be because of the weather conditions. For instance, the laser of your rangefinder may not be able to pick up the flag because of rainy or foggy weather conditions.