I received the square today and tested it on my $200 Mitutoyo High End Perfect Square Square, a Japan hardened version of their engineered square and that's all there is to know. It's made in China, but I'm sure Shinwa Japan does the quality control there. I read a one star review from someone who probably damaged it to get their money back. The one I got matches the entire 12 inch portion of the combo square's line beam exactly, with no light seen between the graduated beams of either square. I'll be happy to buy version 6 of it now.
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review
π§ UEi Test Instruments DAFM3B Digital Multimeter
6 Review