OK so test is complete.
What I found is that the pump works. It also is not obnoxiously loud.
It has a little flashlight on one side of the pump, the light is OPPOSITE of the side where the hose comes out. So while the light is probably very useful, it cannot be used to illuminate the hose end while you try to connect it to your tire.
I compared the pump's gauge to a simple pencil gauge and also to a dial gauge. Both the dial and the pencil gauges were reading identically throughout the testing, so I don't know if they are accurate but they are consistent and match each other. I would note that both of those gauges match the electronic TPMS. The pump's gauge consistently reported a few pounds higher pressures than the TPMS or either the dial or pencil gauge starting at about 40#.
The gauge seems to be "optimistic" in its read out as the pressures goes up the accuracy seems to trail off. Let some air out, starting with 34# of pressure in the tire on the manual gauges, the pump also was reading 34#. As pressure builds it seems like the pump reads a few pounds higher than the manual gauges.
Ultimately I pumped the tire up to 45# of pressure (per the pump's gauge) which equalled roughly 40# of pressure on the TPMS. Realistically I bled off a bit of air removing the screw on connection. Bled off a bit more as I tested the air pressure on the manual gauges. Bled off a bit more as I reinstalled the TPMS.
For $36, including taxes & shipping, I'm very happy with the purchase.
There are more expensive pumps, maybe they work "better" and there are cheaper pumps, but this one is small, packs small with all its accessories, and it actually works. The whole thing, packed inside a zipper case, is about the size of 3 packs of cigarettes, small enough to stow on the bike for trips.
What I found is that the pump works. It also is not obnoxiously loud.
It has a little flashlight on one side of the pump, the light is OPPOSITE of the side where the hose comes out. So while the light is probably very useful, it cannot be used to illuminate the hose end while you try to connect it to your tire.
I compared the pump's gauge to a simple pencil gauge and also to a dial gauge. Both the dial and the pencil gauges were reading identically throughout the testing, so I don't know if they are accurate but they are consistent and match each other. I would note that both of those gauges match the electronic TPMS. The pump's gauge consistently reported a few pounds higher pressures than the TPMS or either the dial or pencil gauge starting at about 40#.
The gauge seems to be "optimistic" in its read out as the pressures goes up the accuracy seems to trail off. Let some air out, starting with 34# of pressure in the tire on the manual gauges, the pump also was reading 34#. As pressure builds it seems like the pump reads a few pounds higher than the manual gauges.
Ultimately I pumped the tire up to 45# of pressure (per the pump's gauge) which equalled roughly 40# of pressure on the TPMS. Realistically I bled off a bit of air removing the screw on connection. Bled off a bit more as I tested the air pressure on the manual gauges. Bled off a bit more as I reinstalled the TPMS.
For $36, including taxes & shipping, I'm very happy with the purchase.
There are more expensive pumps, maybe they work "better" and there are cheaper pumps, but this one is small, packs small with all its accessories, and it actually works. The whole thing, packed inside a zipper case, is about the size of 3 packs of cigarettes, small enough to stow on the bike for trips.