Coopers premium yeast slow to start

[trustyrusty]

Hi
I used a premium yeast from coopers. 48 hours and no bubbling. I think last time was slow or didn’t even bubble. Not sure. But I made a starter and seemed ok with a small head of bubbles. Not sure if I should through kit yeast in? But never had success after opening fermenter. Oxygen seems to cause havoc.

Is this yeast different to others?

Any ideas, hydrometer broke.

Thanks

 

[gap]

Buy another hydrometer very quickly

 

[trustyrusty]

I was in the room for a while and doing something, heard a bubble every 2 minutes maybe so is working.. I have found that yeast not as active or is this too slow, 20 degrees..been about 48 hours, but did read can take 72 hours to get going properly.