于 2002-08-24 01:52 I use the Tetra NO3 tester to test my tank. after I done all the instruction, I found it the colour is red ie >100mg, but then I shake it, the colour become yellow, ie 0mg.
Did anyone used it b4? Please teach me that which reading is correct? (b4 shake or after shake)
THX
樹型目錄
How to use Tetra NO3 tester - edmondyp , 2002-08-24 01:52