Can I use 3rd party probe on p2 or p3?

Yes. I've used the BRS ph probe. It's not nearly the same quality though. I only had to recalibrate my Profilux probe about every 3-4 months. I'm recalibrating my BRS probe every 2-3 weeks. It's gotten to the point that if I see my ph at 9.6 or 6.5, I don't even worry about it --- I just know it's time to calibrate again.

Maybe the Pin Point probe is better...
 
GHL pH probes tend to last over 2 years, work out how much you will pay in replacment generic probes in that time and see if the saving was really worth it? I think the answer is obvious ;)

we supply the kits with the best quality generic probe we can which is supplied for free, this keeps the cost of the packs down, but we do advise after about 8 months or so to invest in a GHL pH probe

Other than pH no other third party probe will work with GHL for good reason - GHL is known for its reliability, why fit something untested and lower your systems reliability and quality.
 
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