A tool that can do more than one job is always a sound investment. Supplied as a pair, these are precisely machined from solid anodised aluminium and have 115mm long legs.
Use them as assembly squares in conjunction with a couple of clamps. These squares are a very effective aid when joining the corners of a drawer or box. You can use them on both internal and external angles. They ensure the joint is at exactly 90
Use the squares for checking the blade and table of saws, bandsaws or fences are at 90