Callaway Pro 300 Rangefinder Guide (Callaway 300 Pro): Specs, Slope Switch, Battery, Magnet and Manual

The Callaway Pro 300 rangefinder, sold officially as the Callaway 300 Pro, is Callaway’s mid-priced slope laser: it ranges 5 to 1,000 yards, locks onto a flag out to 300 yards, reads to ±1 yard through 6x optics, and has an external slope switch that shows green when slope is on and red when it is off. Current units carry a Magnahold magnet in the body, it runs on one CR2 battery, and Callaway TAG lists it at $299.99, with retailers regularly lower.

Below: the full specifications from the 2021 manual, how to use a Callaway Pro 300 button by button, yards to meters, the slope switch, the battery warning, the faults owners run into, and whether it is worth buying over the cheaper CSi Pro.

Callaway Pro 300 or Callaway 300 Pro? The same rangefinder

Callaway’s own name for it is “300 Pro”. “Callaway Pro 300” is how a lot of golfers type it, and how some listings and videos label it, but there is only one product. Two things are easy to mix up with it:

• The older Callaway 300 (no “Pro”), which some review sites still cover. Check the word “PRO” on the body before you buy a used unit or download a manual.
• Colourways and bundles, such as Callaway TAG’s Limited Edition Smoke. The unit inside is the same 300 Pro.

The magnet is the one thing that varies. The 2021 manual does not mention one; current Callaway TAG listings include Magnahold. If magnet grip matters to you on a used unit, look for it before you pay, or budget for a rangefinder magnet strap.

Callaway 300 Pro specifications

How to use a Callaway 300 Pro, button by button

The 300 Pro has two buttons on top, Power and Mode, plus the slope switch on the side and the diopter ring on the eyepiece. This is the sequence the manual gives, in the order you need it on the first tee:

1. Fit a CR2 (see the battery section below), then turn the eyepiece until the aiming circle and numbers are sharp. That is focus for your eye, not zoom.
2. Press and release Power. The unit wakes with the aiming circle showing.
3. Set the slope switch: red for competition (slope off), green for practice (slope on).
4. Press Mode once to toggle between Standard mode and P.A.T. mode. Use P.A.T. (the flagstick icon) for pins; Standard for larger targets such as trees and bunker faces.
5. Aim at the flag and press Power. In P.A.T. mode a short vibration and the Pulse icon confirm that it has locked on the pin rather than the trees behind.
6. To scan, hold Power down: the laser indicator box flashes and the distance updates continuously as you sweep across the green.
7. Let go and wait. The unit switches itself off after about 10 seconds of inactivity.

Aiming technique, and why you should also shoot the front and back of the green, is covered on how to use a golf rangefinder.

How to change a Callaway 300 Pro from meters to yards

Turn the unit off first, then hold the Mode button for about three seconds. The Y/M indicator next to the distance changes. If a hold does nothing, the unit was still awake: let it time out (ten seconds) and try again. The same step for every other brand is on how to change a rangefinder from meters to yards.

The slope switch: green is on, red is off

Slope on the Callaway 300 Pro is a lever on the side of the body. In the green position the unit shows a slope-adjusted “plays like” distance and the angle every time you fire; in the red position it shows the plain, tournament-legal distance. Unlike Bushnell’s Slope-Switch, where a hidden indicator means off, the 300 Pro always shows a colour, so learn which one is which: red means legal.

The Model Local Rule that allows distance-measuring devices requires that the device is not used to measure elevation change during the round, and a switch a playing partner can see settles that faster than a menu. What the green-mode number is actually worth in yards is worked through on what slope does on a rangefinder.

Battery: CR2, the hatch, and the 200-range warning

The 300 Pro takes one CR2 3-volt lithium cell. To change it, lift the hatch tab, turn it counterclockwise to open, remove the protective plastic cover, fit the new cell, and turn the hatch clockwise to close. Do it over a table; the hatch is the part that gets dropped in long grass.

• Empty battery icon: roughly 200 ranges left, according to the manual. That is two or three rounds for most players, so order a spare now.
• Flashing battery icon: replace the cell before the next round.
• Nothing on the display at all: the manual’s first fix is a new battery.

Battery type across every model we have documented is in the finder table on which battery does my rangefinder take.

Callaway 300 Pro problems and fixes

The manual’s troubleshooting table, plus the questions owners ask most often. Most of these are settings, not faults.

A symptom-first table covering every brand is on rangefinder not working. The manual gives a one-year warranty from the original purchase date; how warranty routes compare across brands is on rangefinder repair and warranty.

Magnahold: does the Callaway 300 Pro have a magnet?

Current ones do. Callaway TAG lists “integrated magnets” under the Magnahold name, so the 300 Pro sticks to a steel cart strut without an accessory strap. Older stock may not: the 2021 manual has no mention of a magnet. What a magnet-equipped unit still needs is a case that closes around it, and a steel surface to grip.

• Callaway 300 Pro cases: what ships in the box, replacements and skins
• Rangefinder magnet guide: straps for units without one, and which other models have one built in
• Cart holders and cradles: for push carts, where a magnet has nothing to grip
• All golf rangefinder cases compared

Callaway 300 Pro vs CSi Pro

The CSi Pro is the cheaper Callaway laser most shoppers compare it with. On Callaway TAG’s own pages the two share the essentials and differ on price and one feature:

If the $100 matters, the CSi Pro covers the same flag range with the same magnet. The 300 Pro is the one whose optics and accuracy are documented, and its green/red switch is the clearer tournament signal. Against the Bushnell Tour line, the 300 Pro wins on price and has the magnet as standard; Bushnell’s counterweight is a deeper support network.

What to pay for a Callaway Pro 300

List price is $299.99 at Callaway TAG. Shopping results in September 2026 show it from about $230, and past deal threads on Slickdeals have it at around $170–180 during sales. That makes it a unit to buy on a discount: the timing of those drops is on golf rangefinder deals. Used, check for the magnet and the word PRO on the body, and run through the checklist on buying a used golf rangefinder.

Is the Callaway 300 Pro worth it?

For a golfer who plays competitions and rides a cart, yes, at a discount. It has the three things that matter week to week: a reliable pin lock with vibration, a slope switch anyone can read, and a magnet that removes the need for a strap. Skip it if you play in heavy rain (IPX3 in the manual covers light rain only) or want the most documented support network, where a Bushnell is the safer bet. Every model we cover, with battery and slope control side by side, is on the golf rangefinder model index.