Square looks good nice and strong but it wasn't really square. When I held the short side against the straight edge and drew a line along the long side, flipped it over and drew the other, my edges were about 1/16 inch apart. Checking on a piece of paper and a machine square confirmed my conclusions. However, I was able to straighten it out with a punch and hammer, as I found out on YouTube. The edges are all nice and straight and the sides are parallel, so that's a plus. All said and done, it should work great, but don't think it's straight out of the box.
π Dioxide Controller for Digital Gas Monitoring
5 Review
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
Digital multimeter RGK DM-12
6 Review