In a tank measure the temp of the tank and then the pressure in the tank and use a PT chart to get you close.
In a condenser run just the fan for 15 or more min without the compressor and use outdoor ambient and system pressure to cross the PT chart.
This is assuming someone did not mix the Freon.
In a condenser run just the fan for 15 or more min without the compressor and use outdoor ambient and system pressure to cross the PT chart.
This is assuming someone did not mix the Freon.