The Quick Verdict
Get the Leupold GX-2c. It's $60 cheaper, twice as accurate, waterproof instead of just water-resistant, and runs on a CR2 battery you can find at any pharmacy. The Callaway CSi Pro is worth a look only if you want the longer 1,000-yard range for a course with some genuinely long sightlines — but for most rounds on most courses, the GX-2c wins this comparison going away. Check price at Amazon →
What They Have in Common
Both shoot 6x magnification, both have slope mode with a legal-play toggle, and both carry a 2-year warranty. They're similarly sized and light enough to clip to a bag without thinking about it. Each will lock onto a flag and vibrate or confirm — the basic workflow of "point, shoot, get your yardage" is the same on either unit.
Where They Differ
Accuracy and Range
This is the biggest difference, and it goes in opposite directions depending on what you care about. The GX-2c is rated to ±0.5 yards — that's twice the accuracy of the CSi Pro's ±1 yard. For approach shots into a green, a half-yard matters more than it sounds, especially once you've got your irons dialed in. The CSi Pro counters with a 1,000-yard range versus the GX-2c's 700 yards to reflective targets (and a more modest 450 yards to a pin). Honestly, most golfers are never ranging something 700+ yards away, but if your home course has long par-5s where you're trying to figure out whether you can reach a landmark off the tee, the extra range has some value.
Waterproofing vs Water Resistance
The GX-2c is waterproof. The CSi Pro is water-resistant. These are not the same thing, and it matters. Water-resistant means it'll survive a light drizzle; waterproof means you can play through a real rainstorm and not worry about it. If you play in the Pacific Northwest, the upper Midwest, anywhere in the UK, or you're just someone who doesn't quit when it starts coming down, this spec alone tilts the decision toward Leupold.
Display and Optics
The CSi Pro uses a standard LCD display with multi-coated optics. The GX-2c has what Leupold calls a "bold black display," which in practice tends to read better in bright outdoor light — the high contrast of black figures on a clear background is easier to read than a dim LCD when you're staring into a sunlit fairway. Both are 6x, but display quality in-hand is what actually determines whether you get your number and move on or squint and re-shoot. Seems like Leupold put real thought into the outdoor reading environment here, and it shows in the spec.
Battery
The GX-2c takes a CR2. That's worth noting because CR2 batteries are everywhere — grocery stores, pharmacies, airport convenience stores. If you're mid-round at a muni and your battery dies, you've got options. The CSi Pro doesn't publish battery specs at all, which is a minor red flag when you're deciding what to put in your bag for five years.
Who Should Buy Which
Get the Leupold GX-2c if:
- You want the more accurate unit and don't want to pay more for it — the ±0.5-yard reading is the best spec on this page
- You play early mornings or late afternoons where you need a display that actually reads well in changing light
- You tee off at 6:30am on wet October mornings when the weather turns mid-round and you need a rangefinder that can take it
- You want a dead-simple battery swap without wondering what proprietary cell it takes
Get the Callaway CSi Pro if:
- You're playing a course with legitimately long sightlines — think desert layouts or wide-open links-style tracks — where 700+ yards to a landmark is a real number you'd use
- You're already in the Callaway ecosystem and the branding matters to you (no judgment, it's $60 more for less performance, but it's your money)
The Bottom Line
The GX-2c costs less and performs better in the specs that actually affect your round — accuracy, waterproofing, and display readability. The CSi Pro has more range, but range ceiling is the least interesting spec for most golfers. You're not ranging the clubhouse from the first tee. The $60 you'd save with the Leupold is basically a sleeve of balls and a hot dog at the turn, and the accuracy advantage will show up on every approach shot you take.