What’s right, PH probe or redsea PH test?

[MJV15]

So I just got a pinpoint PH probe, I’ve calibrated it 3 time now. It reads 7 and 10 perfectly but I don’t trust it’s reading on my tank water. It says my tank is at 7.8 despite the fact I’m using a recirculating CO2 scrubber. When I use my Red Sea PH test it shows 8.2-8.4 pretty consistently. So who do I trust? A chemical test or a probe?

 

[GoVols]

So I just got a pinpoint PH probe, I’ve calibrated it 3 time now. It reads 7 and 10 perfectly but I don’t trust it’s reading on my tank water. It says my tank is at 7.8 despite the fact I’m using a recirculating CO2 scrubber. When I use my Red Sea PH test it shows 8.2-8.4 pretty consistently. So who do I trust? A chemical test or a probe?

As Randy always says:
Crosscheck with a handheld ph meter that can be calibrated before use.

 

[ItalCanadaReefer]

As Randy always says:
Crosscheck with a handheld ph meter that can be calibrated before use.

The Hanna HI98103 would work well I believe right?

 

[GoVols]

The Hanna HI98103 would work well I believe right?

Yeah,
Looks like it calibrates to the same solutions (7 and 10) and it does have some nice reviews.