What They Have in Common
Both run on CR2 batteries, measure to 6x magnification, include slope with a legal switch for tournament play, and are rainproof. They'll both lock on a flag and give you a yardage you can trust for a shot into the green. At this price point, either one does the job — the argument is about which one does it better, or lasts longer, or earns more of your confidence.
Where They Differ
Accuracy and Range
This is where TecTecTec swings hard. The ULT-X claims ±0.3 yards to 300 yards — that's tighter than almost anything at this price. The Nikon specs out at ±1 yard to 100 meters, ±2 yards beyond that. Now, ±2 yards on a 180-yard par-3 still means you're picking the right club 99 times out of 100, so let's not pretend this is a real problem. But if you care about the number on the display matching reality as precisely as possible, the ULT-X has the better spec sheet on paper.
The range story also tilts toward TecTecTec — 1,000 yards to hazards versus 800 yards total for the Nikon. For most courses, 800 yards is plenty. You're not lasing a hazard a half mile away. But the ULT-X's 450-yard flag range is worth noting: that covers every par-5 approach you'll ever hit.
Optics and Build
Nikon makes camera glass. That's not a marketing claim — it's what they've done for decades. The COOLSHOT 20i GIII uses multilayer lens coatings, which is standard Nikon optical practice and it shows in low-light or overcast conditions when cheaper glass starts to look muddy. The TecTecTec ULT-X doesn't publish its optical specs in any detail, which isn't a red flag by itself, but it's also not reassuring.
Nikon publishes exact dimensions (91 × 73 × 37 mm, 4.6 oz) and leans into how compact and light it is. TecTecTec publishes neither weight nor dimensions for the ULT-X, which is a curious omission for a product being sold online. Seems like something you'd want to know before it lands in your bag.
Warranty and Brand Confidence
The Nikon comes with a five-year warranty. The ULT-X comes with two years. That's not a trivial gap — a rangefinder you buy today at $220 and replace in year four costs you more than one you buy for $249 and use for six. Nikon's been making optics long enough that their warranty means something. TecTecTec is a smaller brand and probably leans on the lower price point to compensate for the credibility gap — that's my read, anyway.
Who Should Buy Which
Get the Nikon COOLSHOT 20i GIII if:
- You're the golfer who keeps gear for years and wants to know the manufacturer will back it up — five years of coverage on a $220 rangefinder is a genuinely good deal.
- You play early morning rounds in October when the light is flat and you want glass you can actually trust at 6am through the mist.
- You prioritize compact size and light weight — 4.6 oz fits in a shirt pocket without you noticing it's there.
- You've been burned by no-name brands before and want Nikon on the side of the unit when someone at your club asks what you're shooting with.
Get the TecTecTec ULT-X if:
- You're a detail-oriented 8-handicap who actually cares about the difference between 163 and 165 yards — ±0.3-yard accuracy at that range is as tight as it gets at this price.
- You play big courses where hazards are far out and you want a rangefinder that can reach them.
- You want the best spec-per-dollar on paper and you're comfortable with a shorter warranty window.
- You'd rather spend the $29 premium on something real (tighter accuracy) than save it on a name.
The Bottom Line
This one comes down to what you trust more: a tighter accuracy claim from a brand you've never heard of, or proven optical quality and a longer warranty from Nikon at $29 less. CR2 batteries are at every pharmacy in the country, so both are easy to maintain — that's a wash. The ULT-X's accuracy spec is genuinely impressive if it holds up in real use, but TecTecTec doesn't have the track record to take that on faith the way you would with Nikon. I'd go with the COOLSHOT 20i GIII. Better glass, longer warranty, lighter unit, and it costs less.
Get the Nikon COOLSHOT 20i GIII.
See Also