Hi all yet again sorry if i'm becoming a pain.

As title suggests does anyone know of any difference between block testers?

I've had 2 done in the last 2 days,
1 was a screw top where they put liquid in pots labbled 1 and 2

Second was a tube with a squeeze bubble on top which they poored liquid into.

Only reason i ask this is because it failed the block/sniff test with the first 1 but passed with the second so im abit