The first attempt a year ago for a 12 inch Starrette combination square (steel head - smooth steel ruler blade) had 17 holes in the ruler and an uneven head surface. This time I bought a 6 inch ruler (chromed steel head) and a washer that sits under the spring and has two lugs that fit the grooves but don't fit the grooves because they are too far from the alignment are removed. The washer sits at an angle to the full height of one of the bosses.
π Dioxide Controller for Digital Gas Monitoring
5 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
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π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review
Digital multimeter RGK DM-12
6 Review