Ph tester

I use a digital ph pen which is made for pools or any water.They cost about $28 delivered from ebay and will measure to the hundreths of a point and can be calibrated if needed
 
FF, How often is the cal needed? Time? # of uses? or just when the initial reading doesn't seem right?

I use a digital ph pen which is made for pools or any water.They cost about $28 delivered from ebay and will measure to the hundreths of a point and can be calibrated if needed
 
I check my ph pen about every 3 months just to make sure Im on point.I have calibrated once in 2 years with this one as it drifted about .5 ppm
 
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