On Sat, 07 Dec 2019 12:42:16 +0000 (GMT), "Dave Plowman (News)"
wrote:

My trusty old jump start pack which also has a tyre compressor died.
Didn't owe me anything as it had a lot of use as a compressor over the
years. But annoying in that I'd recently fitted a new battery - and it's
the gears between the motor and compressor which have stripped. Motor
still runs, so I'd guess the compressor seized.

One thing that annoyed about it was the useless pressure gauge.

So decided on a replacement. Inflator only, so a lot smaller. Bit like a
cordless drill. Vast range of models and prices on Ebay.

Went for a Blaupunkt. Three times the cost of the cheapest but has an 18v
2 amp.hr battery rather than the cheap ones which all seemed to be 12v 1
amp.hr. But not as expensive as so called 'garage' ones.

It works well - quicker than the old one - but the gauge is still poor.
About 25% out at 30 psi.

Is it really impossible to make a gauge which actually works?

In the handbook, they quote the spec. But not the accuracy of the gauge.


I was looking at gauges from a specialist supplier, they are not that
expensive until you start to add all the costs of fittings to add it
to the pump.

For many (50+) years I've had a pencil gauge and I had a garage
confirm it's readings at around 30psi. It was 3psi slow. The other
day the whole thing flew into pieces so I'd got little rubber seals
and a spring. Put it back together but not checked it out yet.

My Homebase electronic gauge is useless and won't give the same
reading twice.

The inbuilt gauge on my 12v LCAN inflator was too small and inaccurate
to be of any use at all but that device, £8.99 about 25yrs ago, has
recently given up the ghost.

I was googling around to see what I could replace it with but then was
in Wilko for something else and saw they had the RAC610 for £12 and
bought that. I'm not too sure whether I prefer it's screw on valve
fitting or the traditional clip on but anyway it seems to work. The
gauge is a lot more sensible but as best as I can work out 7psi slow.
I've used it about 4 times (two cars) but it's only because I prefer
to top up at home in my own time and not at a garage forecourt where I
don't trust the gauges anyway.


--
AnthonyL

Why do scientists need to BELIEVE in anything?