Using portable helium gas (99.99%)  to find leaks in a lab is basically like using a "super-gas" that can find the tiniest holes that air or water would miss.
Here is the simple breakdown of how it works and why labs use it:
Why Helium?

It’s Tiny: Helium atoms are some of the smallest in the universe. If there is a microscopic crack, helium will find its way through it.

It’s Rare: There isn't much helium in the air we breathe. This means when a detector "smells" helium, it knows for sure there’s a leak coming from your equipment.

It’s Safe: It won't explode, it’s not poisonous, and it won't ruin your expensive lab samples.

We have ready goods for these helium (99.99%) in 4.6L aluminum cylinders, 10L steel cylinders, and 47L steel cylinders in Butterworth, Seberang Perai Pulau PInang Malaysia.