Just received this item.  It is definitely commercial grade.  Have tried it out on all four tires on each of two vehicles.  Gauge is accurate enough.  I've have seldom had two gauges that read exactly the same.  This one is within 1/2 pound of my current high quality gauge.  The numbers on the gauge are easy to read.  The incremental markings between the numbers are more difficult to read but perhaps it's time to get new eye glasses.  I'm very satisfied but will do a follow-up review should I have an issue after more extensive use.