Anyone that reads pH and is cost effective. I buy about 1.5 each year. I found the cheap yellow ones at 4.50 EA (gotta search the A)are great and cheap enough to be disposable if needed. Had a75$ blue lab that lasted a week last year...
the one with spare batteries, some calibration fluid. In my room I like the ones that hasnt been dunked yet. I got a blue one for 25 bucks in 2006, still works like new, its blue, the blue one at amazon prolly
some growers swear by the reflective light from a Red PH pen, while others argue its all in the yellow one. Me? I stand by my Blue PH pen choice and rec. It works, it increases potency and yield and I never sampled better herb. Blue PH pen for the win. https://www.google.com/search?q=han...wQ_AUIBygC#tbm=isch&q=blue+ph+meter&*&imgrc=_
Anyone that reads pH and is cost effective. I buy about 1.5 each year. I found the cheap yellow ones at 4.50 EA (gotta search the A)are great and cheap enough to be disposable if needed. Had a75$ blue lab that lasted a week last year...