RING AUTOMOTIVE RTG7
This is the only unit with an adjustable, 360° swivel-head, so the angle that the gauge is fitted onto a valve can be altered, although we sometimes struggled to fit it without allowing air to escape. It’s the heaviest unit on test, weighing 168g (the lightest is the Accutire at 21g and the next heaviest is Sealey’s TSTPG11 at 73g), and the only one supplied in a small fabric carry case.
Ring’s gauge includes a useful memory function, which displays values for the front and rear tyre pressures. The values are straightforward to set and the readout not only displays the tyre pressure, but also whether the reading is low, high or OK. The tyre pressure doesn’t need to be spot-on to get an OK – we tested a tyre that was a mere 0.1psi lower than the value stored in the memory and the readout said it was OK.
Other features include a torch and a tread depth indicator. The readout is permanently backlit and the gauge is powered by two CR2032 batteries, accessed via a panel on the back and a single crosshead screw. The memory function was retained when we removed the batteries for a few seconds and refitted them. The tread depth indicator provides a range from 0.5-15.5mm. For tyres that are close to the UK’S 1.6mm limit, the scale can be difficult to read, even if you’re being a little cautious at 2-3mm.