Review on Measure Your Tire Pressure With Precision: FOVAL'S Digital Tire Pressure Gauge For Cars At 150 PSI by Jay Williamson

Well designed, especially the stem connector. There is generally 0 loss of air when you place the gauge on the stem, and no loss on removal. On my first try, I though the gauge had not worked because there was no sound of leaking air when I put it on the stem, nor when I took it off to see what was wrong. But the reading was on display, and it had worked as designed - no frustration trying to fasten or remove the valve stem connection from the tire.