Difference between standard and lab grade pH probes?

[PrivateJoker64]

Other than $.

 

[Aquaduck]

Has been answered in this forum already: THREAD

Randy Holmes Farley suggests this COLE PARMER probe for aquarium purposes: U-59001-70

You can read the whole article on pH here: Chemistry and the Aquarium

 

[PrivateJoker64]

Thanks.