It is quite small but for some devices it can get in the way of other ports and plugs. There are small clips which are quite fragile but you can remove the case if you are careful:
Here you can see it just fits with the case removed:
With a device connected it alternates between showing current draw for approx 7 seconds then voltage for 3 seconds.
It is the same schematic for the two, but mine looks like an earlier version. Yours version is optimized a bit: All parts are smd and the printing on the pcb is removed.
It is stable when charging my phone (and you can see how intelligent the phone built-in charger is as it draws less approaching 99% full), and shows a steady 0.03 A for my Logitech wireless receiver.
As HKJ said, the Soshine SC-F3 charger pulses during charge cycle. You can see it more clearly with an ammeter or scope:
I will use it to check the voltage drop of the usb 5v when charging/using high powered devices and measuring the current they draw when charging/using…. also checking the quality of the ps