Rangefinders can provide different ranges for a number of readings. Most center around the settings of the unit. For Gen 1 type products (RX-I, RX-II, RX-III, RX-IV) there are a number of settings that could provide different ranges based on conditions. 2nd (RX-600, RX-750, RX-1000) and 3rd (RX-1000i with DNA) generation rangefinders are also discussed below.
First Target – A “setting” that forces the rangefinder to respond with the first range that it detects. If there is a blade of grass or a small twig from a tree stand, you could be getting a reading different from you expectations.
Last Target – A “setting” that is also available in all rangefinders that helps you “look through” close in targets to provide a range on that last visible target for the rangefinder. Please note that the laser coming out of the unit is very small in diameter and might be obstructed on small targets in front of you (if you are unable to see a distance farther away).
>150 – A mode that will only return ranges past 150 yards. This feature is so you can range out of cover of thick grass or through a tree canopy. If you are ranging a target <150 yards, you will get no range.