Upon receipt of the Accutire MS-5510B Racing Tire Gauge, a quick trial run to the garage revealed that the unit was dead. This gauge was purchased to replace a similar Accutire gauge that I had been using for a year and a half, so I had some of the lithium LR44 batteries in stock. With the replacement batteries, the gauge would turn on and off with the on/off switch, but the clip would not hold the pipe nozzle to the Tire Pressure Monitoring System metal valve stems. I tried both of my cars, same problem. Examined both the new and old pipe nozzles; they appeared to operate identically. One more test try on both cars, and the gauge completely died. Would not even turn on with the manual switch. Enough!! Both Accutire units joined my pile of electronic and automotive junk awaiting recycling.

I immediately ordered a #655035 Jegs Digital Pressure Gauge for $89.99. Far better workmanship and ease of use. Considering the price of the tires on my autos -- $230 ea for one vehicle; $335 front ea/$368 rear ea for the other car -- an accurate and precise tire gauge is a mandatory requirement.

I have been very pleased with this gauge. It seems accurate, is repeatable, and is very easy to read. Makes a great replacement for my Neotech500, which finally died at 25 years. I'd highly recommend it.

In spite of the note at Amazon saying that customers also bought a particular gauge boot, DON'T. It isn't needed (the gauge has a rubber ring already), and the boot they recommend doesn't fit and lacks a hole for the power button.

The gauge works ok. It reads very accurately while you are holding it tight on the valve stem. It drops a tenth or two when you take it off.
It is perfectly fine as a very accurate pressure gauge for normal or professional use. This is not what I would consider a high quality RACING gauge.
Also the chuck would be easier to use if it where a 90 degree end. Guess you need to spend the money for a racing gauge.

Simple and easy to use. Having tenths is helpful to get just the pressure your looking for. If a track junky you'll be happy with it. Especially love backlighting for dark situations. Comes with a canvas pouch for storing.

Much has been written about this product, and I have nothing to add other than the reason for my one star review. The gauge wouldn't seal on any of the tires on either of my cars. Readings were erratic, inconsistent, in short, useless. Also beware if you have short valve stems, as the gauge seems to require longer ones. In my case that made little difference, so I've returned it.