Oakton AO-00653-18 Oakton Conductivity and TDS Standard, 1413 Μs; 500 mL

I use this solution to calibrate my ec/TDS meter. You put a bit in a container and calibrate. Easy to use. Product arrived fast and without damage.

I was expecting data sheet however the data that I thought was missing was printed on the back of the label. Happy with the product which was delivered same day as promised. Will buy again

I should have read the other reviews. The expiration date on this is 5 months away, not suitable for longer storage,

Calibrated as expected. Item received as expected.

El tiempo de expiracion es muy corto

It worked and now my Salt meter works properly

Does the job and arrived quickly.

I used this once to calibrate a water quality sensor we had deployed at a field site. The second time we used the solution, there were black globes of mold growing in it. The standard was wildly off when we attempted to use it (silly to try this) and the solution was within the use date (hadn't expired yet). We stored the solution according to the label and we handled the calibration solution using gloves and on a clean surface. I have used many conductivity solutions and have never had this issue. Maybe it was just a one off, but I will be using a different conductivity solution from here on out. We can't afford to use poor quality calibration solutions to calibrate thousand $$ instruments while in remote places

This is the real stuff. I had a problem with a bad mix of a 1000ppm "calibration standard" NaCl solution when trying to calibrate my EC meter for home hydroponics. Sent it back and bought this. Comes sealed. Has a temperature/EC grid on the label so with a thermometer on hand, it makes calibrating an EC meter dead on accurate. This is laboratory grade. I'll be sticking with this product for calibrations.