Well, all that monkey business with the making and weighign is about out the window.

The 10ml 25,000ppm NIST certified reference samples will likely be sold through Greg Watson, still waiting to hear back.

This way you no longer even test KH at all, ever again.

No need.
Then you only measure pH with a meter/O2 membrane or with the drop checker.

3.489 liters of pure DI water added to the 10 mls will make about 3.5 liters of 4 KH solution.

If you can measure 3.5 liters or a a tiny hair shy(use the 10ml bottle the ref solution comes in to remove the water or to get an idea how much 10mls is), your accuracy is still 99.984% for each 1 ppm of KH.
That assumes the volume you add is within 10mls or so.

I do not think anyone will require more accuracy.
Buying a 500ml volumetric flask will allow precise measure of 3.500 liters of DI water(7 fill ups basically), and you can use it for other standard ref solutions you might want to make for NO3 etc. They also make good stoarge solution containers.

3.5 liters of ref solution will last about based on 2 week changes and 5mls per drop checker, 26 changes per year x 5mls= 130 mls.

3500mls/130mls = 26 + years of accurate CO2 measurements and no KH test kits.
Saves money, time, reduces work load, highly accurate, easy.

Cost: about 10-12$ for the ref sample, 10$ for a 500mls flask, whatever the going rate for pure water might be, and shipping.

Still, about 50X cheaper than all the KH test kits you'll go through and time you waste measuring.

Regards,
Tom Barr

Man, I hope you make all kinds of noise when that reference solutions is out and available...

No, I probably will not, if folks see and go to Greg's site and want it, it'll be there.
Folks here can tell where they got it.

I'll post a blurb on it when it's available.
Depends on Greg truthfully.

Regards,
Tom Barr

Would it help if we do one of those on-line petitions, where we might get 100,000 or so signatures? Maybe only 10,000?

Go bother Greg.

I do not sell direct, I gave that up with CO2 reactors many years ago, I cannot keep shipping straight and don't like having to ship stuff.

Greg is much better at that.
And I am much better haggling what makes a plant grow than Greg, so together it'll work out.

Greg also needs to see the future in this idea and product, he really has not been paying attention due to school demands, so helping him understand what this is all about and why it's good for the hobby and he should sell it is another issue.

Note, both this and the trace dry mix super sauce I've developed, but have not made in a commercial quantity will both be sold through Greg's site.

I'll likely have a few other items by summer as well, including a red inducing system for plants, even ones that are normally green can be turned redder and it does not limit any nutrients or require more light etc.

So we shall see what happens, but a nagging email might help.

Regards,
Tom Barr