Hi Andrew, the 0.05A is the output current and will only be what your fridge's electronics is drawing while the motor is off.

However, your meter could be drawing a lot more current just to power the LEDs, so you will need to measure the current on the input to the meter.

If you have a multi meter, it will have the ability to measure low amps, and you might be very surprised at how much the meter itself draws, and the meter's own power consumption could flatten your battery in a very short time, like in a couple of days of not using your vehicle.