Those Chinese pump it up yourself 5 or 10 minute mini air tanks

I got one of those about a year ago and have not tried it out yet , I have two concerns , first is the air produced by the hand pump "good air" and not contamated by oil from the pump.

second have the cylinders been properly hydrostaticly tested ? they have a stamp but can it be trusted, China after all the people that brought us dry wall powder in dog food.

Like this one?

https://www.amazon.com/SolUptanisu-Cylinder-Pressure-Equipment-Underwater/dp/B07TGBDNYD/ref=sr_1_51?crid=2317WI9G0K13R&dchild=1&keywords=hand+pump+scuba+tank&qid=1578447908&sprefix=hand+pump+scuba%2Caps%2C211&sr=8-51

Yes exactly only I got 4 cylinders and it was cheaper.

I am thinking about automating the pump action with a bicycle so I can use legs instaed of arms to charge the tanks.

but i think i want to get an air quality check before I go to all the bother of adapting the bike . dont know how to go about that

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