What They Have in Common
Both run on a CR2 battery, offer 6x magnification, include slope mode with a legal tournament switch, use first-target priority for flagstick acquisition, and carry Nikon's 5-year warranty. The underlying measurement tech — Locked-On Quake vibration confirmation, ID Slope calculation — is shared DNA. You're choosing between two members of the same family, not two different philosophies.
Where They Differ
Display and Optics
This is the biggest real-world difference. The 50i GII has a red internal OLED display. It's crisp, high-contrast, and reads well even when light conditions get weird — early morning tee times, overcast afternoons, that half-shadow you're standing in on a tree-lined par 4. The 20i GIII uses a standard internal LCD-style display. It works fine; it's not a dealbreaker. But if you've ever tried to read a non-OLED display in awkward light and had to cup your hand around the eyepiece to see the number, you know what you're giving up. The 50i GII also lists "Hyper Read" fast-focus tech, which probably means quicker lock-on in the field — call it a hunch, but OLED plus faster processing tends to show up in feel even when specs look similar.
The 50i GII also lists dual Locked-On Quake — Nikon's vibration feedback when you've locked the flag. The 20i GIII has single. In practice this is minor, but the dual pulse on the 50i GII does feel more definitive when you're flagging from 200 yards out.
Range and Accuracy
The 50i GII reaches out to 1,200 yards on reflective targets and flags to around 400 yards. The 20i GIII tops out at 800 yards. For most golf on most courses, 800 yards is plenty — you're not ranging the green from the car park. But the 50i GII's ±1 yard accuracy is consistent across its entire range. The 20i GIII is ±1 yard to 100 meters and steps up to ±2 yards beyond that. That's still good, but there's a real difference if you're the type who wants a precise number on a 220-yard carry over water.
Build and Weather Protection
The 50i GII is IPX4 rated — that means it can handle rain from any direction and not blink. The 20i GIII is "rainproof," which is a softer claim. It'll survive a shower, but Nikon isn't making the same commitment. If you play in genuinely wet conditions — fall rounds in the Pacific Northwest, early morning dew, anything that involves actual sustained rain — the IPX4 rating on the 50i GII is the kind of spec you're grateful for eventually.
The 20i GIII, for its part, is noticeably smaller and lighter: 4.6 oz versus 7.2 oz, and it fits more easily in a front pocket. The 50i GII adds a cart magnet, which is its answer to the portability question — you slap it on the cart rail and forget about it. Both work; they're just different habits.
Who Should Buy Which
Get the Nikon COOLSHOT 20i GIII if:
- You're the golfer who carries a Sunday bag or walks the course regularly and wants something light enough that you forget it's in your pocket
- You play in dry-to-mild conditions and aren't asking the unit to survive a soaking
- The $80 gap matters to you — that's a sleeve of tour balls every month, or a lesson, or just cash you'd rather keep
- You want a straightforward, accurate rangefinder without extras that don't change your game
Get the Nikon COOLSHOT 50i GII if:
- You tee off at 6:45am in October when the light is flat and bad and you need the OLED to actually read the number cleanly
- You ride a cart more than you walk, and the magnet mount is how you actually want to store the thing between shots
- You play serious competitive rounds where precision beyond 150 yards matters and ±1 yard across all distances is the whole point
- You buy gear to keep it — the better build and IPX4 protection mean this one's more likely to still be going strong in year four
The Bottom Line
The 20i GIII is genuinely good and underpriced for what it delivers. But the 50i GII is the better rangefinder, and the $80 difference is narrower than it looks once you factor in the OLED display, the full IPX4 sealing, and the consistent ±1 accuracy across all distances. If you're buying one rangefinder to use for the next several years, the 50i GII is the one you won't want to trade up from. The 20i GIII is a great deal; the 50i GII is a better purchase.
Get the Nikon COOLSHOT 50i GII.
See Also