Those I was told work good.
I was thinking of putting some of those probes in my sump for my 20.
They don't have a lot of pull down though unlike the ones you are looking at.
I think I might end up with one as well. 
__________________
150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
|