I'll admit it—I wasn't looking for another rangefinder. After testing dozens over the past decade, I figured I'd found my perfect match with a high-end model that cost me nearly $500. But when the Blue Tees Series 4 Ultra landed on my desk, something about that matte Navy finish made me inquisitive. At $299, I expected compromises. What I encountered instead was a device that made me question why I'd been overpaying for years.
Blue Tees Series 4 Ultra golf rangefinder delivers fast, accurate distance readings with a compact design to improve your game on every shot.
Let me start with what shocked me most: the display. I've used rangefinders with LCD screens, basic LED readouts, and everything in between. The Series 4 Ultra's OLED display is genuinely different. We're talking about 4K optics here—yes, actual 4K—which sounds like marketing fluff until you're squinting through morning fog trying to find a flag 200 yards out. The clarity is absurd. Numbers pop off the screen like they're floating in front of your eye.
What really sold me was the auto-ambient brightness feature. I stumbled upon this by accident during a twilight round last month. As the sun dipped behind the trees, I noticed the display automatically dimming to match the conditions. No manual adjustments, no fumbling with buttons while my playing partners waited. It just worked. Compare that to my old rangefinder where I'd constantly toggle between brightness settings depending on whether I was in shade or direct sunlight.
The brightness control goes beyond just convenience though. During a particularly brutal afternoon round in Arizona (think 110 degrees and sun that could melt asphalt), the display cranked up to a level I didn't know was possible. Every number remained crystal clear despite the glare that usually turns rangefinder screens into unreadable mirrors. This isn't just about having fancy technology—it's about actually being able to use your rangefinder when conditions get challenging.
Here's where I need to eat some crow. I've always been the guy saying "who needs half-yard accuracy? Just give me the yardage to the nearest yard and let me play." The Series 4 Ultra proved me wrong, and it happened on a shot that still makes me smile.
Picture this: par 3, slightly uphill, pin tucked behind a bunker at what I thought was 157 yards. My old rangefinder would have said 157 or 158 and called it good. The Series 4 Ultra? 157.5 yards. I grabbed my 7-iron instead of choking down on a 6, and stuck it to four feet. That half-yard made the difference between the right club and almost the right club.
The flag lock technology deserves its own paragraph here. Blue Tees claims it can lock onto flags up to 350 yards away, which sounds impossible until you try it. I tested this on our course's longest par 5, where the flag sits 340 yards from the back tees. Not only did it lock on, but the pulse vibration was instant and confident. No hunting, no second-guessing whether you hit the flag or the trees behind it. The Ultra Magstrip and Auto-Depth Filter work together to filter out background objects that usually confuse lesser rangefinders.
But let's talk about real-world performance, not just specs. During a recent tournament, I watched three guys in my group struggle with their rangefinders on a blind shot over a hill. Trees everywhere, flag barely visible. While they were re-shooting and debating yardages, I got my reading in one attempt: 142.5 yards, slight uphill, playing 146 with slope. The pulse vibration confirmed the lock, and I moved on. That's the kind of confidence that changes how you play. What impressed me most was how the Active Track technology kept the flag centered in my view even as my hands moved slightly, making the whole process effortless.
Every serious golfer needs to understand the slope function controversy. In casual rounds, slope-adjusted distances are incredibly helpful. In tournaments, they're illegal. Most rangefinders make you choose: either buy a slope model for practice or a non-slope model for competition. The Series 4 Ultra solved this brilliantly.
There's an external switch on the side—secure, tactile, impossible to accidentally toggle. Flip it one way, and you get slope-adjusted distances with a clear indicator showing slope is active. Flip it the other way, and you're tournament legal with raw distances only. No removing faceplates, no complicated button sequences, no worrying about whether you're breaking rules. I've used this in three local tournaments now, and every official who's checked it has been impressed by the obvious, visible switch. This approach mirrors what you'll find in models like the Bushnell Tour Hybrid, which also features a tournament-legal switch for disabling slope calculations.
The slope calculations themselves are surprisingly sophisticated. My home course has a par 4 with a 40-foot elevation change from tee to green. Other rangefinders I've tested give wildly different readings—everything from "playing 15 yards shorter" to "playing 8 yards shorter." The Series 4 Ultra consistently reads it at 11 yards shorter, which matches exactly what my course management app says and, more importantly, what actually happens when I play the hole.
What really sets this apart is how it handles subtle elevation changes. You know those holes where you can't quite tell if you're slightly uphill or downhill? The Series 4 Ultra picks up elevation changes as small as 3-4 feet, which might only affect distance by 2-3 yards but could mean the difference between flying the green and landing pin-high. This isn't about overthinking every shot—it's about having accurate information when you need it.
The IP54 rating might not mean much to you, but here's what it means to me: I've used this rangefinder in a downpour. Not a light drizzle, not a passing shower, but the kind of rain where sane people head for the clubhouse. During a charity scramble that nobody wanted to postpone, I played 18 holes in conditions that killed two phones in our group (despite being in "waterproof" cases).
The Series 4 Ultra never skipped a beat. Water beaded off the textured casing, the display remained fog-free, and the buttons stayed responsive even with wet fingers. More impressive was what happened after the round—no moisture inside the lenses, no foggy display the next day, no weird electronic glitches. Just wipe it down and throw it back in the bag.
The textured grip proved its worth in those wet conditions too. While my playing partner's smooth rangefinder kept slipping out of his hands, the Series 4 Ultra's case provided enough texture to maintain a secure grip without feeling abrasive. It's one of those design details you don't appreciate until you need it.
But weather resistance goes beyond just rain. I've left this rangefinder in my car during Phoenix summers (not recommended, but it happens), used it in morning frost, and accidentally dropped it in a bunker. The build quality is genuinely premium—chrome accents that haven't tarnished, a matte Navy finish that still looks fresh after months of use, and internals that seem bulletproof. This feels like a rangefinder built to last a decade, not just a few seasons.
I almost didn't mention the case because who cares about cases, right? Wrong. The Series 4 Ultra's case might be the smartest accessory I've seen in golf tech. There's a magnetic plate built into the case that holds the rangefinder perfectly in place. No more fishing around in the case to grab it, no more fumbling to put it away quickly.
The magnet is strong enough that I can hold the case upside down and shake it—the rangefinder stays put. But it's not so strong that you struggle to remove it. One smooth motion and it's in your hand. After a month of using this system, going back to a traditional case feels prehistoric. The magnetic strip is actually the strongest in its category, which explains why it never failed me even when bouncing around on particularly rough cart paths.
The case itself deserves credit too. Premium materials, reinforced stitching, and a belt loop that actually stays attached (unlike my last three rangefinder cases). There's even a small pocket on the back for a lens cloth or ball marker. It's clear someone who actually plays golf designed this, not just someone checking boxes on a feature list.
Blue Tees Series 4 Ultra golf rangefinder delivers fast, accurate distance readings with a compact design to improve your game on every shot.
Yes, you can use the Blue Tees Series 4 Ultra in tournament play when you turn off the slope mode using its physical switch. The rangefinder meets USGA and R&A standards for competition when slope's disabled. You'll only get distance measurements and target lock vibration, which are both tournament-legal features. Just make sure you've switched off slope before your round, and you're compliant with official tournament rules.
Your Series 4 Ultra Rangefinder comes with a standard 2-year warranty that covers manufacturing and operational defects. You'll need to register your product on the official warranty registration webpage to activate coverage. If you'd like additional protection, there's an optional 1-year warranty extension available for $25. The warranty includes parts and labor but doesn't cover normal wear-and-tear, battery depletion, or cosmetic damage from regular use.
Yes, you can easily replace the battery yourself when it dies. You'll simply unscrew or flip open the small battery door on your device, slide out the old CR2 battery, and insert a new one with correct polarity. No special tools are needed - sometimes a small flat tool helps if it's tight. When you see the lightning bolt icon or E2 error code on your display, it's time to swap batteries.
You'll get decent performance in light fog and rain thanks to the IP54 weather rating and Auto-Depth Filter that helps cut through visibility issues. The OLED display's brightness control also aids viewing in these conditions. However, you shouldn't expect reliable measurements in heavy rain or dense fog - the laser signal gets scattered and accuracy drops. While it's splash-resistant with protective seals, it's not fully waterproof, so avoid prolonged exposure to heavy downpours.
Yes, you'll pair your Series 4 Ultra with the Blue Tees Golf App (GAME app), available on iOS and Android. Once connected, you'll access over 42,000 preloaded courses worldwide, GPS data for hazards and greens, shot tracking, and an AI-powered caddie. The app syncs seamlessly with your rangefinder's OLED magnetic features and provides post-round analytics. It's highly rated at 4.8 stars with 50,000+ downloads and offers premium features for improved performance.
The Blue Tees Series 4 Ultra occupies a unique space in the rangefinder market. It's not the cheapest option for beginners, and it's not the most expensive toy for gear collectors. Instead, it's a serious tool for golfers who want professional-grade accuracy without the professional-grade price tag. If you're shooting in the 70s and 80s and want every advantage within the rules, this rangefinder delivers. If you're the type who plays in all weather conditions and needs equipment that won't let you down, this is your answer. For anyone else still using a rangefinder from five years ago (or considering their initial serious upgrade), the Series 4 Ultra makes a persuasive case that premium features don't require premium prices.
