Try holding an empty polythene bag over the nozzle and depress the trigger. It should fill the bag with gas. You should be able to work out flow rate by timing how long it takes to fill a bag, then working out how much the bag will hold. e.g. a large food bag might hold 5 litres, if it fills in 30 seconds you flow rate will be 10 l/min. I know it's not very accurate and a but primitive, but you will get a rough idea of your flow rate.
You can measure the volume of the bag by filling with water from a jug.
Obviously you'll need to squeeze the air out of the bag first, and hold it tightly around the nozzle.
Hope this helps
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