The Quick Verdict
Get the Leupold GX-2c. At $149.99, it's $90 cheaper than the Nikon, and the accuracy gap alone makes the price difference easy to justify — the GX-2c is rated to ±0.5 yards versus the Nikon's ±1 yard (and ±2 yards beyond 100 meters). Consider the COOLSHOT 20i GIII only if weight is a genuine priority for you and the $90 gap doesn't sting. Check price at Amazon →
What They Have in Common
Both are tier-4 rangefinders with 6x magnification, slope mode, and CR2 batteries. They're waterproof in the sense that neither is going to die in a light rain. Each fits in a pocket without much fuss. That's about where the similarities end — the spec differences here are meaningful enough to actually change which one you should buy.
Where They Differ
Accuracy
This is the one that matters most. The GX-2c is rated at ±0.5 yards. The COOLSHOT 20i GIII comes in at ±1 yard to 100 meters, then opens up to ±2 yards beyond that. For most approach shots — say, a 150-yard 7-iron — a 2-yard error is the difference between short of the pin and on top of it. Leupold's DNA engine has a solid reputation for delivering on its accuracy spec, and at this price point, ±0.5 yards is genuinely impressive. The Nikon's numbers aren't embarrassing, but they're looser.
Slope Tech
Both have slope mode, but they take different approaches. The GX-2c uses Leupold's TGR system, which calculates a "True Golf Range" — factoring in elevation change to give you a single adjusted yardage you can just play. It also includes a Club Selector feature that factors in your typical distances, which sounds gimmicky but can be useful when you're between clubs on an uphill approach. The Nikon uses ID Technology for slope and has a physical slope-switch to toggle it off for tournament play. The GX-2c also allows you to turn slope off, so both cover the compliance angle. Neither system is dramatically better than the other — this one's a wash.
Size and Weight
The Nikon wins here, and it's not close. At 4.6 oz and roughly the size of a deck of cards, the COOLSHOT 20i GIII is noticeably smaller and lighter than the GX-2c's 7 oz. If you're carrying and want to keep your bag light, that 2.4-ounce difference is real. The Nikon's multilayer lens coating is also worth noting — it's a genuine optical feature, not just marketing language, and it helps in lower-light conditions.
Water Resistance and Warranty
The GX-2c is listed as fully waterproof. The Nikon is rainproof, which is a step down. If you regularly tee off in wet conditions — or you're just rough on gear — that distinction matters. On warranty, the Nikon actually wins: 5 years to Leupold's 2. That's a meaningful gap for a piece of gear you're carrying every round.
Who Should Buy Which
Get the Leupold GX-2c if:
- You want the most accurate yardage you can get at this price. The ±0.5 yard spec is better than what a lot of rangefinders twice the price offer.
- You play in genuinely wet conditions — early morning rounds in the fall when the fairways are soaked and you're worried about dunking your gear in a puddle.
- You're carrying a bag on a tight budget and the $90 gap matters. That's a round of golf at a decent muni.
- You play varied courses and want the Club Selector feature to help when you're between clubs on a sidehill lie.
Get the Nikon COOLSHOT 20i GIII if:
- You're a walker who feels every ounce and the GX-2c's 7 oz genuinely bothers you on a hilly course.
- You want a longer warranty — 5 years is the kind of coverage that actually makes a difference on a piece of electronics you're pulling in and out of your bag 80 times a round.
- Low-light optics matter to you. The multilayer coating on the Nikon does help at dawn or in heavy overcast, and if you're regularly squinting through your rangefinder in the shade of a tree, better glass is better glass.
The Bottom Line
The GX-2c is the better rangefinder for most golfers at this comparison. It's more accurate, it's fully waterproof, and it costs $90 less. The Nikon is lighter and carries a longer warranty, which are real points in its favor — but a 2-yard accuracy gap on approach shots is the kind of thing that affects your actual scores. CR2 batteries are available at any drugstore, so neither one has an edge there. The Nikon's 5-year warranty is the most compelling argument for paying more, but honestly, a rangefinder that's more accurate is a more useful tool.