dmpmfd
New member
I've started searching for a replacement to my Apera PH20 pen (possibly coming to EOL of sensor) and wanting to get one that the sensor can be replaced once worn out. I was leaning towards the PH60 series, but I found they have a "new to me" GS series which seems to be meant for growers as opposed to lab testing. From my quick searches so far it seems to be $10-20 cheaper to the PH60 series but was wondering if the community has ever tried/had one of the GS series testers and if so, how did it compare to your previous model(s)?
