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

Works as advertised.

Good size works well definitely by again

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

Last a long time

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

I had recently bought a TDS meter ( HM Digital TDS-3 Handheld TDS Meter With Carrying Case, http://www.amazon.com/gp/product/B000VTQM70/ref=cm_cr_ryp_prd_ttl_sol_11) for home use. This 342 ppm TDS calibration liquid is must for the meter. Although the meter description says it doesn’t require calibration but it is always good to calibrate it. It comes in a very sturdy plastic bottle, which is leak-proof. You always need at least two calibration points to correctly calibrate a metering/measuring device. Therefore, I also bought another calibration liquid for 1000 ppm (HM Digital 1000ppm TDS Calibration Solution: http://www.amazon.com/gp/product/B001FD6WZ8/ref=cm_cr_ryp_prd_ttl_sol_0 ). Many people have mentioned that you can make the calibration liquid at home by dissolving a known amount of sodium chloride in water. I would like to mention that its wont be a good idea. First, the water itself is not pure and you don’t know what is its PPM value. Second, and important, weighing 0.1 to 0.5 g at any weighing balance we have at home is impossible. So spend some money and buy it. You wont regret it. I calibrated the meter with bot solutions and then measured a few liquids f known ppm value and the reading I got was fairly accurate (within 5% of actual). Always clean you TDS meter thoroughly before dipping it in the calibration liquid. Else you may change the concentration of the liquid, which will lead to wrong reading from your test water sample. !!!!!!! I STRONGLY ADVISE TO BUY THIS CALIBRATION LIQUID WHEN YOU BUY A TDS METER !!!!!!

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

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

Great

Excellent product!

Gute qualitet und Rechnung war auch sofort da Danke

Excellent produit 👍

Ok