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The digital Accutire MS-4400B and MS-4021B are said to be accurate, but may not be very rugged. The Intercomp 360060 4" dial gauge is much more expensive, harder to use, but will probably last much longer.
If a digital gauge is self admittedly accurate only to +/- 1 psi, why does it report to the nearest tenth of a psi?
That seems misleading confidence. Shouldnt it just do the rounding and truncate the hell up at the single units digit?
It's a marketing gimmick to make people believe that digital is more accurate. The sad part is that it seems to work. You can get some very accurate digital gauges, but the price would be 2x or 3x the price of an analogue gauge of the same accuracy.
The digital Accutire MS-4400B and MS-4021B are said to be accurate, but may not be very rugged. The Intercomp 360060 4" dial gauge is much more expensive, harder to use, but will probably last much longer.
Rick, what are your thoughts about the concern expressed in one of above post regarding the long term reliability of this product If it needs to keep the Schroeder valve open in order to read the tire pressures?
1. The primary air seal is the valve cap (which shouldn't be the flexible rubber kind) the Schroeder valve is a convenience to keep the air in while you check the pressures.
2. The problem is that the unit on the valve stem is large and susceptible to being knocked off if you scrap a curb.
3. Long term sealing ability won't be any more of a problem than it is on any other kind of valve cap.
The valve cap is sometimes called a "dust cap" and it's purpose is to keep crap out of the valve stem. Without these monitoring caps, the primary air seal is the Schrader valve at the bottom of the stem. Without the valve cap, dirt and water can get to the top of the valve, potentially jamming it open a bit causing a leak. In areas where they de-ice the roads in winter, without a dust cap, salt or other chemicals can corrode the brass components and similarly cause a leak. The value cap is important, but it's not the primary air seal.
These remote pressure monitor caps keep the Schrader valve open permanently (they have to do that so that the sensor in the cap can measure the tire pressure), and therefore the monitoring cap must provide the primary air seal, not the Schrader valve. In reality, if you knock one off on a verb, the Schrader valve will close and seal the tire.
Time will tell, but I question the reliability of such a system for it's intended purpose. The external and vulnerable monitor cap providing the primary seal seems risky.
Isn't 45.6 still more than 45.2 even if the accuracy is +/-1? You can still see that it went down approximately 0.4 psi, but you still only know that the pressure is somewhere between 44.2 and 46.2 psi if it changed from 45.6 to 45.2 (given that the accuracy is accurate).
The valve cap is sometimes called a "dust cap" and it's purpose is to keep crap out of the valve stem. Without these monitoring caps, the primary air seal is the Schrader valve at the bottom of the stem. Without the valve cap, dirt and water can get to the top of the valve, potentially jamming it open a bit causing a leak. In areas where they de-ice the roads in winter, without a dust cap, salt or other chemicals can corrode the brass components and similarly cause a leak. The value cap is important, but it's not the primary air seal.
Most of my older cars have come with those black plastic caps which I don't think have a good seal, but the valve seems to be sufficient unless it isn't screwed in tight.Let's just say I and the tire manufacturers disagree about what the primary air seal is and leave it at that.
Let's just say I and the tire manufacturers disagree about what the primary air seal is and leave it at that.