Hanna Instruments HI7031L 1413 µs/cm Conductivity Calibration Solution, 500mL Bottle
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Keeping the cap on should keep the juice fresh for many months as long as it is kept in a cool, dark place. There is one at work that is more than a couple of years old, and it still works well. Evaporation would cause the EC of the solution to increase, so it's best to avoid it.
Selected User Reviews For Hanna Instruments HI7031L 1413 µs/cm Conductivity Calibration Solution, 500mL Bottle
The bottle's seal had been completely broken and opened as soon as I received it. I'm not sure what your answer is. It's probably ok, but not.
The conductivity calibration solution arrived on time and in My experience with it was that it worked as expected and has been ok so far. I love it.
Its calibration solution is what you expect from a product of this type. The products they make are really good and there is no reason not to use them. It is unlikely that other brands would work with it.
We received the item on time and it is exactly as described.
In order to calibrate a conductivity probe (K=) from Atlas Scientific, I used this product. The first one. The probe I used was from Mettler-Toledo I went to Toledo to compare the solutions and they were accurate.
This is a great deal.