Very accurate meter. Overall quality is acceptable for bench use. 9v battery may not last long with the backlight turning on constantly. The meter does power off after a few minutes. Voltage measurement is spot on. Amps tend to climb under constant 11Amp load... shunt may have a slight positive temperature coefficient. so I would stay under 10A definitely not 20.
Electrically everything is fine with the Meter and this time I also got one with a “good” case. This one (right hand side fotos) has a real silicone sleeve and the case doesn’t squeak a bit. On the left hand side you can see my first one, now glued shut. However the most important part is to add some tape in the battery/fuse compartment.