Lots of gauges out there and you don't have to spend much $ either.
1. Get a good digital gauge like Accutire MS 4021B
$12 This becomes your "Master Gauge and you do not use it to check tires but to confirm your "work gauge is accurate and consistent with a once a month check or if you get strange readings from the dual foot gauge
2. Get a dual foot gauge like Milton
($20)and use this to check your tires daily.
Better yet get a TPMS ($360 for 6 tire
) and know the tire pressure is OK all the time
. You can still use the hand gauge (Milton) once a month or so to be sure the TPMS is staying reasonable. Once you set your tire pressure using your hand gauge you will see slightly different psi reading from TPMS. THIS IS NOT A PROBLEM. The TPMS is designed to warn of air loss. you will soon get use to the readings you get from the TPMS.
Above is what I bought and use.
Even the most expensive or most accurate hand gauge can't tell you the pressure as you drive down the road or even 5 minutes after you pull out of the campground with a slow leak from that drywall screw you drove over on the exit road.