The Quick Verdict
Get the COOLSHOT 20i GIII. At $239.95, it does what a rangefinder needs to do — slope, decent accuracy, fast enough reads — and saves you $290 in the process. The PROIII STABILIZED is a legitimately better piece of glass, but "better" costs a lot here, and most golfers won't feel the difference on the course. Spring for the PROIII only if image stabilization is a genuine problem for you, not a theoretical one. Check price at Amazon →
What They Have in Common
Both are Nikon rangefinders with 6x magnification, slope mode with a toggle (legal for competition), a 5-year warranty, and CR2 battery power. They use the same first-target-priority logic to lock on the flag rather than whatever's behind it. At the baseline, you're getting Nikon optics and a legit slope reading from either one.
Where They Differ
Price and What You're Actually Paying For
The PROIII STABILIZED costs $529.95. The 20i GIII costs $239.95. That $290 gap is real money — a couple rounds of green fees, or a new wedge if you've been eyeing one. So the question isn't whether the PROIII is better (it is), it's whether it's $290 better for your specific round of golf.
Image Stabilization and Read Speed
Here's the clearest difference: the PROIII STABILIZED has optical image stabilization. The 20i GIII doesn't. If you've ever had trouble holding a rangefinder steady — shaky hands, early morning cold, or just standing awkwardly between shots — stabilization is genuinely useful. It smooths out the wobble and makes it easier to land the reticle on a flag 180 yards out.
The PROIII also reads in 0.1 seconds with its Hyper Read system, and it has a dual-locked-on confirmation versus the 20i GIII's single. In practice, the 20i GIII's 8-second scan mode does the job, but if instant confirmation matters to you, the PROIII has it.
Display Quality
The PROIII STABILIZED runs a red OLED display with auto brightness. That's a meaningful upgrade — OLED is sharper and the auto brightness means it adjusts to your lighting conditions instead of making you squint in full sun or get blasted in shade. The 20i GIII has a standard internal display. It works fine, but it's not the same reading experience. Nobody reads a rangefinder under ideal conditions; they read it in the glare of a summer afternoon or with sunglasses on. The OLED gives you a better chance.
Water Resistance and Range
The PROIII carries an IPX4 rating, meaning it can handle rain from any direction — not just a light sprinkle. The 20i GIII is rainproof, which is fine for most rounds but a step below. If you play in Scotland or just live somewhere that rains sideways, this matters.
Range is also different: 800 yards for the 20i GIII versus 1,200 yards for the PROIII. On a golf course this rarely comes up, but if you play anything longer than a normal layout, or use it for other distance sports, the PROIII has headroom.
The 20i GIII is also noticeably smaller and lighter — 4.6 oz versus 7.2 oz. That's a real difference in your pocket for four hours.
Who Should Buy Which
Get the COOLSHOT 20i GIII if:
- You play two or three times a month and want a reliable rangefinder that won't make you think about it. This one disappears into your bag and does its job.
- You're buying your first slope-enabled rangefinder and don't want to spend $530 before you know how much you'll actually use it.
- You're a compact-kit person — it's 4.6 oz and small enough to slide into a shorts pocket without the bulk.
- You want a legitimate 5-year warranty without paying flagship prices for it.
Get the COOLSHOT PROIII STABILIZED if:
- You've genuinely struggled to hold a rangefinder steady. Not "it's a little hard sometimes" — but genuinely shaky reads that affect your confidence. The stabilization fixes that.
- You play before dawn or in low-light conditions regularly enough that a crisp OLED display would change your experience.
- You're playing longer, more serious rounds and want the most confident flag-lock available from this brand.
- You play in real rain — not mist, actual rain — and you don't want to baby your equipment.
The Bottom Line
The PROIII STABILIZED is a better rangefinder. The display is better, the waterproofing is better, and stabilization is a real feature if you need it. But $290 better? For most golfers, no. The 20i GIII reads slope, locks on the flag, fits in your pocket, and comes with the same warranty. That covers 90% of what a rangefinder does on a Saturday round. I'd put the $290 toward something that actually shows up in your scorecard.