What They Have in Common
Both are $299 rangefinders with 6x magnification, ±1 yard accuracy, and 1,200-yard range. Both have slope with a legal switch, a single CR2 battery, water resistance, and vibration confirmation on flag lock. At this tier, you're not compromising on the fundamentals with either one — you're choosing between different emphases on top of a solid shared foundation.
Where They Differ
Flag Lock and Targeting
This is where they actually diverge in feel. Nikon's Dual Locked-On Quake uses what they call a two-stage vibration pattern — it pulses once when it acquires the flag, then again to confirm lock. In practice, that second confirmation is reassuring on mid-range approach shots where you're not totally sure you grabbed the pin and not the tree behind it. The Blue Tees uses a single pulse-vibration system, which is perfectly functional, but it's a one-stage answer to the same question.
Nikon also lists flag acquisition out to ~400 yards versus Blue Tees' 350. That gap won't matter on most courses, but on a long par-5 where you're trying to laser the flag from 380 yards away, it might.
Display
Both have OLED displays, but they're different animals. The Blue Tees runs a standard OLED with user-adjustable brightness control, which is genuinely useful — anyone who's tried to read a dim display at 7am when the sun's just starting to cut through knows how much that adjustment matters. Nikon's display is a red internal OLED, which gives it strong contrast in low light and a clean look, but you don't get the same brightness flexibility.
Honestly, this one's a toss-up depending on your conditions. Bright midday round? Probably even. Early tee time in flat light? The Blue Tees' adjustable brightness has an edge.
Warranty
Nikon includes a five-year warranty. Blue Tees doesn't publish one in their spec materials. That's a meaningful gap. A rangefinder is a piece of gear you're dropping on cart paths, leaving in hot trunks, and occasionally fumbling into wet grass. Five years of coverage versus an unclear warranty is real money — probably more real than the $0.99 price difference. Seems like Nikon is leaning hard on that warranty as a confidence signal, and they've earned it.
Build and Magnet
The Blue Tees has an "ultra magstrip" — their term for a stronger-than-average magnetic mounting strip on the side. If you use a magnetic cart mount, this matters. The Nikon has a cart magnet too, but doesn't spec it as anything beyond standard. Nikon publishes its weight (7.2 oz) and dimensions; Blue Tees doesn't, which is a minor frustration when you're trying to compare how these things actually feel in your hand.
Who Should Buy Which
Get the Blue Tees Series 4 Ultra if:
- You tee off early or play in variable light and actually use a brightness-adjustable display rather than just squinting through it
- You're running a magnetic cart mount and want the strongest hold available — bumpy cart paths are not friendly to standard magnets
- You like a brand with a strong direct-to-consumer relationship and responsive customer support (Blue Tees has built a reputation for this, though I'd flag that's a qualitative read, not a spec)
Get the Nikon COOLSHOT 50i GII if:
- You're the golfer who plays the same course for years and wants one rangefinder to outlast a couple of phone upgrades — the five-year warranty is the whole argument
- You're locking flags on longer approach shots consistently and want the extra 50 yards of flag acquisition range to take that variable off the table
- You've ever second-guessed a rangefinder lock mid-round and wanted more confirmation; the two-stage vibration is a small thing that adds up over a full round
The Bottom Line
At a dollar apart, this is a features fight, not a price fight. The Blue Tees Series 4 Ultra is a genuinely good rangefinder and the adjustable OLED display is a real differentiator. But Nikon's five-year warranty, the two-stage flag lock, and the brand's optical reputation tip the balance. CR2 batteries are everywhere, both units will hold up in light rain, and both will give you accurate yardages. The edge goes to Nikon on confidence and longevity.
Get the Nikon COOLSHOT 50i GII.
See Also