pH calibration fluid?

[kevin_e]

Is this a quality product for calibration?

Atlas Scientific pH 7.00 & 10.00 Calibration Solution 125ml - 4oz (Pack of 2) https://www.amazon.com/dp/B007X5JQF0/ref=cm_sw_r_cp_apa_i_ZX-ECbW2CADP1

 

[Brad Miller]

My opinion is it’s a good name brand and is reusable in 4oz containers.
I use the Neptune ones from hrs at about $2 for each one and just order them with other stuff I get for the free shipping but it’s only a little bit

 

[kevin_e]

My opinion is it’s a good name brand and is reusable in 4oz containers.
I use the Neptune ones from hrs at about $2 for each one and just order them with other stuff I get for the free shipping but it’s only a little bit

Thanks. I am reading 7.53 right now with an Apex double junction probe. pH is ranging from 7.5 - 7.65 throughout the day. I find that highly unbelievable. We have a 1200 SF apt with 2 ppl and 3 dogs and we keep the unit closed up here in humid Florida, so CO2 does build. However, I run my skimmer line outside AND with an inline CO2 scrubber. There is no way that's an accurate pH range.

 

[Randy Holmes-Farley Verified Community Expert]

I don't know about those, but pH standards are "follow the published recipe" easy to make, so unless they are old (especially pH 10), it is likely good enough for our purposes.