I have tried the machine you mentioned. It is electronic. I blew 5200, which is easier to blow high. Pay attention to the following points:
1. The most important thing is not to block it. The air outlet below, otherwise it will be difficult to blow
2. Don’t blow too hard, because as long as you blow, the numbers will run away, mainly because it takes a long time. The growth rate is also so fast.
3. To prevent air leakage, block the funnel tightly, otherwise air leakage is not good
I hope you pass the test
My experience is to first go deep into the environment. Take a puff (not too strong, as it may cause a blow), then completely close the funnel with your mouth, and blow the first puff with all your strength (generally your value is at this point).
Don’t blow slowly. 1. If you blow slowly, you will easily be out of breath. You may inhale instinctively, and then blowing will be in vain.
2. That machine relies on air to push water. Blowing slowly will waste most of the air on blowing water, and the remaining air blows on the machine.
Note: My vital capacity is 4000