This is clearly a solid tire pressure gauge. It's definitely the largest, and bigger is better, right? Well, when it comes to pressure-related instruments, I do believe larger pressure sensors make the instrument more sensitive.
I bought this about 8 months ago at the same time that I bought a new-to-me Porsche 996TT. Low-profile tires on aftermarket wheels are notoriously difficult to maintain a constant tire pressure, so some periodic measurements are necessary to ensure tire life and safety. What turned me on about this product is that it is supposed to be accurate within 0.5%. In other words, if the true PSI is 50, then this gauge would read between 49.75 and 50.25. To me, a quarter point is an acceptable level of error. Other gauges, even the Moroso 89560, have an error of 2%, which would put the reading somewhere between 49 and 51.
Other high points of this gauge are the great air-tight seal it makes with the stem, the super convenient bleeder valve, and the high quality rubber. Nothing is cheap on this product. A AAA tow guy once stopped me at a gas station to ask about this gauge; he was enthralled.
There are some downsides to this gauge, though. The biggest is that it's so large and so sensitive, you probably don't want to be driving around with it in your car despite its foam-padded case. This is a precision instrument. I decided to buy a 89560 to keep in the car in case of emergency use ($40).
Overall recommendation: Buy if you have to have the best, but keep a beater in the car for emergencies.Get more detail about Moroso 89562 Pro Series Tire Pressure Gauge.
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