Kinex Hardened Flanged Set-up Square (with base) 100mm

Product Review (submitted on 4 October 2018):

My first proper accurate square, really useful, used for everything now.

Best features, Its thick, so easy to line up on wood to check for squareness, little lip makes it particularly user-friendly when using on fiddly little cuts, also good for recalibrating the miter saw (as James mentioned above). Lip allows it to stand up on the bench so easy to reach all the time (especially if you are messy like me with tools surrounding your project). It is one of the tools which comes back into the house with me at night time now... Love it!