I originally considered some plastic positioning squares but most of them had mixed reviews. I stumbled across these and although they are more expensive than the plastic ones they are also cheaper than some of the other more well known brands. I bought 2 sets of 2 (4 total) and am very happy with them. They appear to be fairly accurate and well made.
TOFL Woodworking Clamping Cabinets: πͺ The Ultimate Storage Solution for Workshop Positioning
12 Review
DM-202
14 Review
Enhance Your Woodworking Experience π§ with Wellmax Spring Clamps Woodworking Backdrops
11 Review
Versatile and Durable: Discover the AmazonBasics 14 Piece Nylon Spring Clamp Set
12 Review