I use one gauge at the house. It's made for racers and it's a little pricey but the accuracy is to within .5% and reads to the 1/10 of a pound. You can find them for 55 to 60 dollars online if you want to pay that much for one. It's an Accutire racing tire gauge with an internal bleed off valve.

Yes, I do my own maintenance and I am a little anal about it but we all have our vices... sometimes more than one....