The budget way into knowing your distances. 6x magnification, ±1 yard accuracy, flag-lock with a jolt to confirm, slope toggle, CR2 battery, about 6.5 oz, and roughly $80–110 — call it a third of what a disc-golf-specific unit costs.
Rangefinders are legal in PDGA play, by the way. Rule 813.02 (Illegal Device) bans devices that directly assist in making a throw; measuring distance isn’t that. Unlike ball golf, disc golf never had to change a rule to allow them.
Here’s the honest framing, and it applies to every rangefinder: the number doesn’t pick your disc. This is a field-work tool first. Throw each mold repeatedly at measured distances, write down what actually carries, and then the number on the tee means something. Buy one to support practice you’re already doing, not instead of it.
Two real caveats for us specifically. It reads in yards, not feet — you’ll be converting all day. And the display is black-only, which is genuinely harder to read against a tree line than it is against a fairway.