I had to replace floating thermometer number 2. I ordered another one from Midwest & decided to order some regular orange bottle caps. Got two bags of those delivered yesterday. Hey, my birthday's Tuesday & I needed'em anyway. I was surprised to find that this floating thermometer is different from the others. It has this soft plastic hanger thing pushed down over the top. It's that rounded top part that pops small holes on the other ones. So this one should last longer.Plus it came in a round tube, rather than those square two piece ones. So now I also have another hydrometer tube that's a bit shorter than the others, with only one capped end that should hold about an ounce less. :rockin: