Does the meter work on AC?
It is switched to AC?
Or, are the leads plugged into the jacks for ACV?
Meters are configured in many different ways.
Plug it into a wall outlet for 117 or 234. Does AU use 234VAC? (i.e. 220, 230, 240)
Can you post a pic of the meter in use?
One that shows the legend for the lead jacks?