Milwaukee Instruments MA9015 Storage Solution for pH/ORP Electrode, 230 mL Volume

The product is exactly what is needed for storing your PH meters. I have found that although this works very well some meters are not water tight and therefore will not hold any amount of solution. If this is the case you have a small sponge in the cap will keep moisture present. I do suggest before using your PH meter to clean off this product with distilled water as the solution does have a specific PH related to it. Please Never use distilled water for a storage solution as it will ruin you unit.

fast delivery and keeps my instruments safe

I’ve used Milwaukee PH storage solution for at least 10 years for my Hannah ph probe. I was weary about buying from Amazon since they only guarantee a 30 day expiration date. This expires 9/2023, not bad.

Works well. There really isn't a whole lot to say about it.

I like to stick with brand name that matches my instruments and thru Amazon, pricing and shipping couldn't be better :)

Did a side by side drying test with my current brand (blue lab) , that has kept my pH been alive and well for sometime now . Seems to be identical in amount of active ingredient and the visual inspection of crystal structure looks identical also. I think this will be my new brand from now on , and only a fraction of the cost per amount.

Works fine, however in less then 1 year mold is growing in the bottle, expiration date is 02/2021, many years from now. Since we never stick anything in the bottle and the cap is only open for a minute or so at a time I have to say that's a problem.

If you use a pH meter then you know how important the storage solution is. Just like all other storage solutions it will leave a crusty layer of grainy material if you store the probe for log periods of time.