If I buy a new Ph meter from Amazon.com do I need to order the 7.0 calibration too?
A Afghan Haze Member Feb 26, 2012 #1 If I buy a new Ph meter from Amazon.com do I need to order the 7.0 calibration too?
B BigDawg Member Feb 26, 2012 #2 make sure the pen is 2 point calibration. you need 4.0 and 7.0 calibration solution.
NeWcS Active member Mar 5, 2012 #3 You should be able to go to your local hydro store and buy a 4 & 7 one time use. They come in these little bags. They are like $.50 a piece. Recl before every grow to see if your meter is drifting.
You should be able to go to your local hydro store and buy a 4 & 7 one time use. They come in these little bags. They are like $.50 a piece. Recl before every grow to see if your meter is drifting.
D daishere Member Mar 7, 2012 #4 i check my calibration about every 5 batches of nuts. may be overkill but id hate to have nute lock out from ph.
i check my calibration about every 5 batches of nuts. may be overkill but id hate to have nute lock out from ph.
