The Quick Verdict
Get the Garmin Approach Z10. These are the same price, same tier and same magnification, but the Z10 adds Bluetooth, Range Relay, Find My Garmin, a cart magnet and a published year of battery life. The TecTecTec ULT-S is the one to consider if optical image stabilization matters to you — it's a real feature that helps with hand shake — but the Z10's connected features carry the rest. Check price at PlayBetter →
What They Have in Common
Both are $299.99 rangefinders with 6x magnification, ±1-yard accuracy, slope mode with a tournament toggle, and vibration lock to confirm when you've hit the flag. Neither recharges: the Z10 takes a CR2 and the ULT-S a CR123. The real question is what else you want the device to do.
Where They Differ
Display Technology
The Z10 uses a transparent PDLC display with black readouts. The ULT-S uses an LCD. Neither is objectively better, but if you've never used a transparent display, I'd try to look through a Z10 before buying — it's not for everyone.
Optical Stabilization
The ULT-S has OIS — optical image stabilization — and the Z10 doesn't. This is the ULT-S's clearest functional advantage. When you're measuring 200 yards to a flag, small hand tremors get amplified through a 6x lens, and stabilization is there to reduce that shake. If you've ever struggled to lock onto a flag because your hands won't stay still, stabilization is a real quality-of-life upgrade. Garmin doesn't publish an equivalent feature on the Z10.
Connectivity and Ecosystem
The Z10 has Bluetooth, Range Relay (which sends yardages to a compatible Garmin watch, handheld or the Garmin Golf app), and Find My Garmin — a locator feature that helps if you set it down on the cart and drive off without it. TecTecTec lists none of this for the ULT-S. If you're already in the Garmin ecosystem, Range Relay is a genuinely useful feature. If you're not, it's something you won't miss. Find My Garmin, though, is a small practical thing — CR2 batteries are everywhere, but your rangefinder rolling under the seat is its own problem.
Battery and Build
Here's something that doesn't show up in spec comparisons but matters on the course: the Z10 runs on a CR2 battery with up to a year of life, and CR2 batteries are at every pharmacy in the country. The ULT-S uses a CR123 lithium cell, and TecTecTec doesn't publish a battery life for it. Not a dealbreaker either way, but worth knowing. On water resistance, the Z10 is rated IPX4 (splashes from any direction), while TecTecTec describes the ULT-S as "rainproof" without publishing a formal IP rating. Call it a slight edge to Garmin for transparency, if nothing else.
The ULT-S also doesn't publish weight or dimensions, which is a small frustration when you're trying to figure out how it'll sit in your bag or on a cart clip.
Who Should Buy Which
Get the Garmin Approach Z10 if:
- You want connectivity — you use a compatible Garmin watch or handheld and want Range Relay to send it your ranged yardages
- You're the golfer who's left a rangefinder on the cart twice this season and would genuinely use Find My Garmin
- You're curious about transparent-display technology and want to try something different from the standard LCD readout
- You play mornings when conditions vary and want the confidence of a formally rated water-resistance spec
Get the TecTecTec ULT-S if:
- You want optical image stabilization — you know your hands aren't perfectly steady at range and stabilization makes a real difference when locking onto the flag
- You've used LCD displays your whole golf life and have zero interest in adapting to a heads-up format
- You play in fog or low-visibility conditions regularly — the ULT-S lists a dedicated fog mode that the Z10 doesn't
- You're not in the Garmin ecosystem and the connectivity features are genuinely irrelevant to you
The Bottom Line
At identical prices, this comes down to what problem you're trying to solve. The Z10 is the more connected, more fully featured device with a transparent display that sets it apart visually. The ULT-S fights back with optical stabilization and fog mode — real, tangible advantages for golfers who need them. I'd still go Garmin: a published year of battery life, an IPX4 rating, and extras like Range Relay and Find My Garmin cover more golfers than OIS and fog mode do.