C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue

Works great excellent product. Brought everything door needed to be for collaboration of calibration.

Good size works well definitely by again

Last a long time

It is good to have this to calibrate my TDS tester. I have never needed to calibrate my tester but decided to make sure that it still works after 3 years ilof periodic usage. Only issue is the cost and there is so much of it that I won't need to use again for a few more years.

Clearly reveals that an old meter readings are wrong and needs to be replaced. My old meter was reading properly for distilled, filtered, and tap water. However, it only measured a little over 200 when inserted into this solution. Bought a new meter that measures very close to 340

Not even close to advertised ppm. Claims it is 342ppm, measured on 3 diff devices at more than 70ppm off. Consistently 269 - 275ppm. Whats the point if its not even close? Lol. What a waste

Short of making calibration solution yourself, this is must have calibration solution for the HM COM-100 TDS digital meter. This calibration fluid can be used to calibrate any NaCl TDS tester. Which calibration fluid you buy will depend on what your testing needs are. Do you need KCl or NaCl calibration fluid? If testing pool or spa water, you'll want this type of calibration fluid, NaCl calibration fluid. The calibration solution also comes in 1000 ppm. You want to calibrate using the calibration solution that closely matches your daily testing needs. If you're going be testing household water, you're best served by the 342 ppm calibration solution. If you're going be testing pool/spa water you're best served by the 1000 ppm calibration solution. To calibrate the HM COM-100, place the meter in calibration mode by holding the middle button for a few seconds until the screen displays "CAL", lower the tester directly into the calibration fluid container and use the up/down arrow to scroll the numbers displayed on the scree until the digital display matches the calibration fluid concentration. It's that easy. You're now ready to test your water. Hope the above helps.

I had a lot of problems doing calibration with my HM DIGITAL TDS-3 METER was getting 320 then 411 then 422 then 511 then 477 readings. I thought something was wrong with the solution but I have since found out that the HM Digital TDS-3 I bought is a knock-off FAKE and so it is not the solution like you said, it's the meter itself. I contacted the manufacturer HM DIGITAL and sent them photos of the meter Amazon shipped to me and they instantly said it was a FAKE. NOTICE TO EVERYONE: A real original HM Digital TDS-3 meter will have these traits: 1. when you turn the meter on it will show "HM" in the display for a second or two then it will display 000 but it must show HM when you first turn on 2. a real one will have 5 bumps on each edge of the front, not just in the photo on description page, but on the actual product itself. if it doesn't have the 5 bumps on each side it is a fake 3. it will have instructions how to calibrate in black letters on the back along with a hole and a screw to calibrate it manually many amazon sellers have these traits in their photos but when the product arrives it doesn't have the 5 bumps on each side, doesn't have the calibration printed in black on the back with a screw to calibrate, and doesn't show "HM" when you first turn it on across the screen. the HM will be big and easily see when you turn it on. BTW: MANUFACTURER CONFIRMED THIS IS THE REAL HM DIGITAL CALIBRATION SOLUTION

I calibrated my TDS meter just fine. I used a better air tight jar and poured it all into it, that way I can use it multiple times. I will buy again. Delivery good.

Great

Excellent product!

Gute qualitet und Rechnung war auch sofort da Danke

Excellent produit 👍