I invented and machine the OmniSquare myself, and have sold thousands of them to very happy customers. Go to my website, www.omnitoolworks.com and watch the full demonstration video of it. It shows all of its uses very well, and should answer any question.
The OmniSquare folds up and can be carried in your back or side pocket, quickly and positively clicks into all positions shown, and really has more uses than any square I know of.
It clicks in at 90, 45, and 135 degrees (for square and miter angles), sets as a Combination square (mark repetitive depths, rip cuts, etc.), sets as a T- Bevel square with angle degree readout (set at, or copy and transfer any degree angle), sets as a handy T square, and can even be set to mark circles up to 12” in diameter.
This is not some imported junk, its quality made in the USA. The stock and blade are machined from aluminum and anodized. The inch markings are die stamped and filled with powder coat paint for high visibility and durability. All hardware is stainless steel, so there’s nothing to rust. The angle settings are very precise, and it really should last a lifetime. A note for welders is that welding sparks don't accidentally adhere to the anodized aluminum body.
It really is worth checking out my demo video of it (and also check out the video my new Square Gauges for Rafter/Framing squares) at www.omnitoolworks.com , where you can purchase either for $19.95 plus $5.00 postage/handling (P&H discounts on multiple orders)