Do these pH testers work for reef water?

[Benga]

I'm not sure if it works for saltwater or not since it says hydroponics.
I'm just tired of the guessing game i'm playing with the API high range pH tester. I can never match the colors..

Item in question:
https://www.ebay.com/itm/Digital-PH...152591&hash=item466230ca68:g:HOEAAOSw5UZY~zAH

 

[Lasse]

I´m not sure that you are out of the guessing game just because you use that type of pH meters. They will work in saltwater but please read this post from me in another thread before you decide yourself.

Sincerely Lasse

 

[Randy Holmes-Farley Verified Community Expert]

I cannot be sure how reliable such a cheap meter will be, but at least you can calibrate it and check against a standard (unlike a kit).

 

[Benga]

I cannot be sure how reliable such a cheap meter will be, but at least you can calibrate it and check against a standard (unlike a kit).

is there anyway to tell what my ph is likely to be through other readings like alkalinity?
For the price i might as well just go with a salifert test since i hear good things about theirs.

 

[Randy Holmes-Farley Verified Community Expert]

pH is of secondary importance, in most cases, but no other test gives similar info.