Quinhydrone, pH 4 / pH7

[ZachB]

Anyone here have some extra quinhydrone, pH4 calibration solution and pH7 calibration solution they would be willing to sell?

 

[andywe]

I have some PH 7 and 10, as well as ORP if you need. I can sell you a set for whatever it cost me.

The PH was a buck each...have to check the ORP. 6 weeks old (meaning fresh and new).

 

[ZachB]

I have some PH 7 and 10, as well as ORP if you need. I can sell you a set for whatever it cost me.

The PH was a buck each...have to check the ORP. 6 weeks old (meaning fresh and new).

The pH4 and pH 7 are mixed with the quinhydrone to make the ORP calibration solution. Let the probe settle on 7, then let it settle on 4 (each mixed with quinhydrone) - more accurate than using 400.