Auto Inclinometer, Hoek Helling Tilt Indicator Niveau Meter Gradiënt Balancer Finder Tool Voor Auto Voertuig, 5.5x5.6x 5.95cm

Not great, not bad. It's a fun gimmick, not much more. Who really needs these things? If you do serious offroading, buy a proper one. If you like the looks, go for it.