The Quick Verdict
These two are priced within ten dollars of each other — essentially the same money — but they're not the same rangefinder. Get the Blue Tees Captain Air. The rechargeable battery, brighter dual-color display, and shot-tracking features make it the more useful device day to day. The COOLSHOT 20i GIII is worth a look only if you specifically want Nikon's optics heritage and don't mind buying CR2 batteries. Check price at Amazon →
What They Have in Common
Both rangefinders hit ±1 yard accuracy at reasonable distances, offer 6x magnification, and include slope with a tournament-legal switch. Either one is going to tell you the pin is 163 yards. The real differences are everything around that number — how the device powers itself, how it displays information, and what it does with the data after the round.
Where They Differ
Display and Optics
The Captain Air uses a dual-color HD LED display — red and black — which means the readout is actively lit rather than relying on ambient light through the eyepiece. If you've ever tried to read a traditional internal display on a bright day while squinting into the eyepiece with your palm shading the back, you know why this matters. The COOLSHOT 20i GIII uses a conventional internal display with Nikon's multilayer coating on the optics. Nikon's glass has a genuine reputation, and the multilayer coating does help in lower-light situations. That said, coating quality and display type are different problems — the Captain Air sidesteps the readability issue entirely with the LED approach.
Accuracy — The Fine Print
Both claim ±1 yard, but Nikon's spec sheet is more honest about the limits: it's ±1 yard to 100 meters, then ±2 yards beyond that. Blue Tees doesn't publish that kind of range-dependent breakdown, which could mean the ±1 claim holds further out — or it could mean they're just not publishing the nuance. I'd guess the real-world performance is similar, but Nikon's transparency here is worth noting.
Battery
This is probably the biggest practical difference. The Captain Air is USB-C rechargeable — same cable as your phone, your watch, your earbuds. The COOLSHOT 20i GIII runs on a CR2 lithium battery. CR2s are at most pharmacies and sporting goods stores, so you won't be stranded, but you will be buying them periodically and remembering to keep a spare in your bag. The USB-C approach means you plug it in the night before like any other device. For most golfers, that's just simpler.
Extra Features and Build
The Captain Air adds shot tracking and a find-my-rangefinder function — genuinely useful if you play enough rounds to want post-round data or if you've ever left a $250 device on the 14th green. It's also IP65-rated, which is a real waterproofing standard (dust-tight, water jets). The COOLSHOT 20i GIII is listed as "rainproof," which is less specific. Nikon does back it with a five-year warranty, though — the Captain Air's warranty terms aren't in the published specs, so that gap is real.
Who Should Buy Which
Get the Blue Tees Captain Air if:
- You want a rangefinder that charges the same way everything else in your bag does — no CR2 hunting required
- You play enough rounds that post-round shot tracking actually gets looked at (or you're working on yardage management with your game)
- You've ever lost or almost lost a rangefinder on the course and want a backup locator
- You play in genuinely bad weather and want the confidence of a rated IP65 seal rather than "rainproof"
Get the Nikon COOLSHOT 20i GIII if:
- You trust Nikon's optics specifically and want multilayer-coated glass in a compact, 130g body that disappears in a pocket
- You're the golfer who keeps a CR2 in the bag anyway — maybe you already use other lithium-battery devices — and you value Nikon's five-year warranty as a meaningful backstop
- You're buying this as a gift for someone who plays intermittently and won't reliably remember to charge it between rounds
The Bottom Line
For ten dollars of separation, the Captain Air is doing more: better battery system, a brighter display, IP65 waterproofing, shot tracking, and the find-my-rangefinder safety net. The COOLSHOT 20i GIII isn't a bad rangefinder — Nikon's optics are legitimate and the five-year warranty is nothing to dismiss — but it's asking you to maintain a separate battery supply and giving up useful features to do it. At the same price, that's a tough trade to justify.