Question about ph probes

[Lilmatty5dimes]

is there really a differences between the $40+ probes that Neptune sells and the ones you get off eBay? Like this. https://www.ebay.com/itm/281610629860

 

[naptalene]

I've got the same question.
If it's just Ph monitoring I'm leaning towards the cheap option as you're watching trends more than exact values and the calibration should get you pretty close. Calcium reactor controller..... I'd really like the cheap one to work but don't think I'd risk it personally.

 

[Lilmatty5dimes]

Bump