The Quick Verdict
Get the Shot Scope PRO L5. For $10 less, you get 7x magnification to the Nikon's 6x, an OLED display, and a 1,300-yard range against 800 — and on the features that actually affect your round, it wins cleanly. The Nikon COOLSHOT 20i GIII is worth considering only if weight is a genuine priority: at 4.6 oz versus the PRO L5's 12 oz, it's a significantly lighter carry, and that gap is real. Check price at Shot Scope →
What They Have in Common
Both rangefinders offer slope mode with a legal-play switch and run on a CR2 battery. Shot Scope rates the PRO L5 at ±1 yard; Nikon rates the 20i GIII at ±1 yard to 100 m and ±2 yards beyond. Nikon calls it rainproof and Shot Scope calls the PRO L5 water-resistant — neither publishes an IP rating — and both cover more than enough range for anything you'd actually hit on a course. The baseline is solid either way.
Where They Differ
Optics and Display
The PRO L5 runs 7x magnification to the Nikon's 6x. That extra power might sound small, but on a 200-yard approach to a tucked flag, a bigger image of the pin is what you want. The PRO L5 also uses an OLED display. Nikon lists a multilayer lens coating and an internal display for the 20i GIII, and doesn't say what kind of display it is. Nobody reads a rangefinder in perfect studio light; they read it shaded under their hand, squinting into gray skies — and I'd guess that's where the OLED earns its place, though that's my bet rather than a published spec.
Weight and Portability
Here's where the Nikon fights back. At 4.6 oz, it's less than half the weight of the PRO L5 at 12 oz. That's not a rounding error — that's the difference between something you forget is in your pocket and something you notice is there. The Nikon's dimensions are also more compact. If you're walking 36 holes or you just hate carrying anything extra, that difference is legitimate. The PRO L5 does include a strong magnet mount, which offloads the weight to your cart or bag, but if you're a walker who keeps it in your front pocket, the Nikon is the more comfortable carry.
Range and Feature Set
Shot Scope quotes 1,300 yards on the PRO L5. Nikon tops out at 800. In practice, the pin you're measuring is probably 180 yards away, so this gap rarely matters for golf — but it's there if you ever want to range a landmark or figure out how far the hazard actually is. The PRO L5 also includes pulse vibration confirmation, which is legitimately useful: you feel the buzz, you trust the lock, you club up and go. Nikon lists its LOCKED ON QUAKE feature for the 20i GIII; I won't guess at how it compares to the PRO L5's pulse vibration. Shot Scope also publishes a measure count of ~5,800 per CR2 battery. Nikon doesn't publish an equivalent number, which doesn't mean the battery life is bad — just that you'll find out the hard way.
Warranty
Nikon offers a five-year warranty. Shot Scope gives you two. If longevity of coverage matters to you — and for something you're carrying every round, it should — the Nikon holds an edge here.
Who Should Buy Which
Get the Shot Scope PRO L5 if:
- You want an OLED display rather than an unspecified internal one for gray mornings and flat light.
- You play cart golf and the magnetic mount means weight never enters the equation.
- You're the golfer who wants confirmation — the pulse vibration tells you the lock is solid before you step up to the ball.
- You want the stronger overall feature package and you're fine that it costs $10 less.
Get the Nikon COOLSHOT 20i GIII if:
- You walk every round and keep your rangefinder in your pocket — 4.6 oz versus 12 oz is something you'll feel by the 14th hole.
- You want five years of warranty coverage instead of two, and you're buying something you plan to keep.
- You've tried heavier rangefinders and keep leaving them in the bag because they're annoying to carry.
The Bottom Line
These two are priced within $10 of each other, which makes the PRO L5's advantages genuinely hard to argue against. Better magnification and an OLED display — those are real-round improvements, not spec-sheet noise. The Nikon counters with a weight advantage that's significant if you're a walker and a five-year warranty that's meaningfully better. But for most golfers, the PRO L5 delivers more of what you actually use on the course, at a slightly lower price.