conductivity. Nearly all tds pens are really just ec pens - so this is sort of like a tds of 10 1/2. Very soft water.Beautiful. What does ec 21 stand for?
conductivity. Nearly all tds pens are really just ec pens - so this is sort of like a tds of 10 1/2. Very soft water.Beautiful. What does ec 21 stand for?
Nope but they sure do head butt a lot.What is the evolutionary advantage of having the hump on the head? Any ideas?