Hello everyone, I am in the market for a ph meter/pen. I looked through ebay and found a lot of different makes of ph testing devices. I am wondering which is the way to go...
I would like to get a 3in1 meter but there pricey. I was thinking of a ph meter that constatnly runs but thought a pen is better since i already have a tds pen.
The tds pen i have i was able to get from a walgreens in the water filtering section for 20 dollars. I seen on ebay they have similar ones but for ph testing. I really did not want to have to calibrate or use buffers. I found a couple that state no calibration needed it is automatic. Can anyone let me know if that is possible? it seems they all need to use a buffer ?