Well known pressure gauge, I used to find these things unsurpassed in terms of accuracy. This is more accurate than all kinds of dials we own (had owned them, they'll be scrap soon) and a service and refill type hose end gauge that I hooked up to my 2 1/2 hp compressor. I'll buy more as very inexpensive gifts and as not-so-subtle hints to end the under-inflated tire excuses. The numbers are a little hard to read if you have old man vision problems.