What They Have in Common
Both are 6x magnification rangefinders with slope mode and a way to toggle it off for tournament play. Both claim ±1 unit accuracy (yards vs. meters — more on that below). Both have water resistance and a magnetic cart mount. That's a reasonable baseline. But the shared feature list runs out fast — these two go pretty different directions from there.
Where They Differ
Accuracy and Range
This is the biggest one. The A1-Slope is rated ±1 yard at 350 yards. The Z30 is rated ±1 meter — which is about 3.3 feet, or roughly 1.1 yards. In practice, both will get you close enough for most approach shots, but the Bushnell's stated accuracy is meaningfully tighter, and its range goes up to 1,300 yards versus the Garmin's 400. The Z30's 400-yard flag limit covers the vast majority of golf shots, so that range gap won't matter often. But when you want a yardage from way back in the fairway or to a feature you can't reach with 400 yards, the A1-Slope has it and the Z30 doesn't.
Display
The Z30 uses a transparent OLED in red — you're looking through the display, not at it overlaid on a black background. It's genuinely different from most rangefinder displays, and it works well in bright light. The A1-Slope runs a standard LCD. Neither is bad, but they're a different experience. Nobody reads a rangefinder in direct sunlight anyway — you cup your hand around the eyepiece — but if you've tried transparent OLED and prefer it, that's a real thing worth knowing about yourself.
Size and Weight
The A1-Slope is noticeably smaller and lighter: 5.1 oz versus the Z30's 7.4 oz, and considerably more compact in every dimension. Bushnell calls it their smallest rangefinder ever, and holding both, you'd feel the difference. If you carry your bag or just hate extra weight, the A1-Slope wins here. The Z30 isn't heavy, but it's a more substantial device.
Battery
Here's where the Z30 has a real argument. The A1-Slope is USB-C rechargeable with 50+ rounds of battery life — which is excellent if you actually remember to charge it. The Z30 runs on a single CR2 battery rated for up to a year of use. CR2 batteries are at every pharmacy in the country, and swapping one mid-season takes ten seconds. If you're the kind of person who has found a dead device in their bag on the first tee, a CR2-powered rangefinder removes that problem entirely. That's probably more valuable than it sounds on a spec sheet.
Garmin Extras
The Z30 includes Range Relay (which sends yardage to compatible Garmin devices) and Find My Garmin, which is handy if you regularly leave things in cart cups. These are Garmin ecosystem features — useful if you're already in that world, irrelevant if you're not.
Who Should Buy Which
Get the Bushnell A1-Slope if:
- You carry your bag and shave grams where you can — 5.1 oz in your pocket versus 7.4 oz adds up over 18 holes
- You want the tightest stated accuracy and the longest range available between these two, and don't want to think about caveats
- You're a USB-C charger household and plugging in your rangefinder after a round is just part of your routine
- You play courses with long par-5s or want yardages to objects beyond 400 yards
Get the Garmin Approach Z30 if:
- You're the person who has shown up to a round with a dead rangefinder and doesn't want to be that person again — a CR2 battery lives in your bag forever and the device runs for a year
- You're already using Garmin devices and want Range Relay to push yardages automatically
- The transparent OLED display appeals to you genuinely, not just on paper — it is a different viewing experience
- You're on a tighter budget and $71 in savings is real money
The Bottom Line
These two are further apart than the price gap suggests. The A1-Slope is the more capable rangefinder: better accuracy, dramatically more range, and a significantly smaller package. The Z30 makes a reasonable case on battery convenience and price, and the Garmin ecosystem integration is a real plus if it applies to you. But if you're buying a rangefinder to get accurate yardages and carry it around a course, the A1-Slope does that job better.
Get the Bushnell A1-Slope.