It could be used if you had to, but adjustments for beer use would be clunky.
If you can replace the (high pressure) tank connection shaft/nut that goes into the regulator head with a standard CGA 320 one it will fit a standard CO2 tank.
The high pressure dial gauge is just an indication of the tank's pressure/fill level, usually around 1000-1200 psi (6.9-8.2 MPa on your gauge). But that high pressure gauge is rather meaningless when the tank is mostly liquid CO2 with some gas on top, and typical pressure remains in that narrow range until most of the liquid is gone and you're literally running on fumes. IOW, when the tank only or mostly contains pressurized gas (not much or no liquid left at all) the gauge will start to drop and pretty fast. Be ready for a refill or tank swap in the near future.
On the low pressure side the gauge indicates your reduced pressure set by how far you turn the regulator knob.
For beer, serving or carbonating, you'd be running it at 10-20 psi ([EDIT] 0.07-0.14 MPa). Remember, 0.1 MPa = 14.5 psi.
The lowest number on the scale in 0.2 MPa, so you'd be operating it in the small space on the left bottom, between 0 and 0.2 MPa at the most.
So that's a very, very narrow range to adjust pressure.
IOW, you'd be dialing in your pressure between 2 of the (thin) subdivisions on that gauge between 0 and 0.2 MPa, the space of 1/4 of an inch at the most.
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