Found those kind shite tbh. This is quite good for the money. http://www.demon-tweeks.co.uk/motorcycle/tyre-pressure-gauges/moto-gp-tyre-pressure-monitor
I use one of these - works well https://www.amazon.co.uk/Accutire-Digital-Pressure-Rubberized-Bar-10-34/dp/B00080QHMM
I have a few a snap on digital one that is good. Also a analog one that is calibrated., It may seem daft spending a bit more money on a tyre pressure gauge but it's worth while. especially with bikes where a few PSI can make a big difference
+1 on this gauge - I have one almost the same. I'd go for an analogue gauge with a release valve. The electric ones are ok if you're checking whilst out on the bike, but if you're checking in your garage you may as well get a proper gauge. IMHO!
No point in having a tyre pressure guage that can't tell the pressure correctly. My advice buy a good un. Mike.
I use a Michelin like this which gives me good accuracy (over reads by 0.5psi). It is very small and has a little built in LED ligh But also have a high accuracy mechanical one.