Need Trident Calibration Fluid or other option????

[VashonBigs]

It’s been out of stock for months. Is there an alternative to buy other than testing my own water? Looking for more precision. https://shop.neptunesystems.com/products/trident-calibration-solution?variant=14653947904052

 

[Biglew11]

You should be able to use this as it has the known values. You can even use it to verify your test kits.
https://www.bulkreefsupply.com/fauna-marin-multi-reference-solution.html

20$ for 100ml. Seems kind of steep though.