I bought this EZ Air because of the reviews on Amazon.  Its a unique design, their web site says its patented. It has a Schrader valve on the gauge so you can fill a tire through it, so you can measure and fill at the same time, as an adjunct to any dedicated gauge on the air pump.Meiser can manufacture custom gauges with different logos or company names, so many look alike models sold under different names are very likely theirs.  The original one is cheapest, the custom named versions go as high as $30.Pros1. Check and fill tires simultaneously.  For typical consumer gauges, you'd have to fill tires then measure pressure as 2 separate steps, this is often because the gauges built into air compressors are not as accurate as stand alone gauges.  If you do this often, on say 4 car tires, it can be cumbersome.  If this EZ Air works as designed, it saves a step that adds up over time.2. Quick Connect Clip On Air Chuck.  Like pencil gauges, you press and get quick pressure read, but with the clip on, you can add air, check pressure, bleed pressure, and repeat as often, with less motion because the gauge remains connected to the tire.3. Flexible hose.  Allows you to position the chuck or yourself, to a more comfortable working position, and the hose swivels on this axis.4. Brass construction.  While the machining is a bit rough, its rare to see gauges of this type this cheap.  The chuck, hose, bleed valve assembly, and gauge assembly are screwed in, and the hoses have crimped connectors on them.  This means should the assembly get dirty by grease, dust or dirt, as is often in garages, it possible to do some DIY servicing to clean it out.  The bleeder valve assembly is hot glued shut, but it can be scraped out if needed.  Brass is good low cost material to make pressure gauges out off as its light weight, easy to clean, and doesn't rust.5. Rubber gauge guard, makes it easy to grasp the gauge.6. Accuracy. I compared EZ Air's readings with a digital gauge and 3 pencil gauges read on the tire by itself alone then on using EZ Air simultaneously through the air inlet port.  It was within &lt;1.5 psi compared to them.7. Numbers are easy to read compared to a smaller pencil gauge.Cons1. Clip on Air Chuck takes some skill to connect properly.  Many reviews complain it leaks or won't seat properly.  I found it will work ~100% of the time if you push it in to the tire valve firmly, before locking it in place; this is what the instructions say anyway.  If not connected well and you are filling the tire with air, it will hiss and leak, and confirms the problem.2. Air chuck is big.  The air chuck works well on tires without wheel covers, because the large air chuck may not fit the limited space where the valves stick out of the tire covers.3. If the air chuck doesn't sit completely, it will read low.  Make sure you push the chuck in firmly before engaging the lock.4. The air chuck has a floating brass valve that seals against a thick rubber gasket.  Since it floats, there is a tiny enough space that can pick up dust and dirt, causing it to leak, regardless of what you do.  Its easy enough to unscrew, blow out or wipe clean.I'd deduct a star because of the air chuck could make an error prone reading.  However it works so well once the technique is learned, and almost never leaks air when attaching to a tire compared to most gauges I've used, that's its pros overweight its con.A pencil gauge is far simpler and error free since if you hear the pencil gauge leak or hiss, you're not measuring the tire properly, with EZ Air, you can still connect it improperly without a leak.EZ Air is better when you think you'll fill the tire, rather than just reading its pressure.  Pencil gauges are smaller, have few parts that can go wrong, compact and dirt cheap, so its more practical as the go-to gauge for just checking pressure, rather than filling tires.  I buy them at Walmart for $2-3 each, check they are accurate for the pressure I need then leave 2 each in all my cars.