Ok, I’ll grant you, not very high-tech – but when I got the opportunity to get on of these to test, I happily jumped at the opportunity as I don’t trust the tire pressure inflators in the few garages out here in the wilds that actually have one (I think from WW2 in one case) as they all give different readings.
The 70mai Midrive TP03 12V Portable Car Tire Inflator works well and reliably. I’m going on nothing more than experience (several decades of driving) for accuracy – it feels and sounds right.
When the inflator arrived I could not understand why it would not charge – then quickly realised that’s because it doesn’t have a battery – you plug it into the car cigarette lighter (of, I suggest, an idling car) to use, not to charge. My second thought was – will the power lead be long enough for the unit to reach the spare in the back of the car? Yes, though in a BIG car you might wish to ensure you have a second power socket (cigarette lighter socket) in the back of the car.
The unit is small and sturdy, comes in a nice container and I can think of no reason NOT to leave it in the boot permanently. The stock photos in the link above are much nicer than my photos but then if I used the former, you would have no idea if I’d actually used this thing.
The TP03 offers a clear display (I ended up with strobing effects in my photo attempts), shows readings in 3 formats including BAR and PSI – I use PSI. From memory I knew my tires should be 30 PSI – on checking with the TP03 they were around 22-24 PSI – and the SPARE in the boot was around 8PSI. They are now all at exactly 30 PSI and they even LOOK about right. Next time I’m in a big city I’ll compare with readings from two brand new garages but for now I’m happy the result is near enough.
As a last comment, the steering FEELS much lighter so clearly my tires WERE too far down (we last checked them after a drive to the nearest garage in the height of Spanish summer heat – not a good idea now I come to think about it) whereas today I filled the tires in front of our house with outside temperatures around 18c. The TP03 comes ready to weork with normal car tyres but supplied with 3 adaptors – see link if interested.
So, am I happy? Yes, absolutely.