DuvinDD 18 Pack pH Calibration Solution Powder 6.86/4.00/9.18, pH Buffer Calibration Solution Packets for Precisely Calibrate pH Meter, pH Tester Calibration Powder Packets

Item Reviewed: DuvinDD 15 Pack pH Buffer Calibration Solution Powder pH 6.86/4.01/9.18 for Precisely Calibrate pH Meter, pH Tester Calibration Powder Packets Price at time of order: $6.99 Great set of pH buffer powder packets for meter calibration and checks. You get 5 each of 6.86, 4.01, and 9.18. I use these to calibrate my Vivosun pH meter and they work wonderfully for that. Once I mix and use the packets for calibrating my Vivosun meter I use the reamining solution to test my other pH meter to proactively monitor for drift. Can't go wrong with these for $7 and I'm happy to recommend them.

This pH calibration solution works as expected. Shipping was fast. The powders dissolve easily and I was able to calibrate my pH meter without any issues. The seller is also worth mentioning. They were helpful and responsive when I had a question. Good customer service is always a plus. Overall, a solid product and a good buying experience. I would definitely recommend.

Works as expected I hope but like others have said the crystals don’t dissolve very quickly for certain ph. I just mix and then come back a half hour later to mix again

Seem as described haven’t used yet

Works exactly like it should product seems to be good for accurate calibration for a good price.

The team was very adamant about ensuring that my pH monitor was satisfactorily calibrated... while the first few powders they sent did not dissolve properly and appeared to not calibrate correctly, they proactively reached out to verify it was working (without me even issuing a complaint) and sent replacement powders for free. The first set of replacements did not work, so they sent a second set of replacements, which worked well and calibrated my pH monitor as expected.

Shipping was fast and on time. Product performed as described. I will buy again. Buy with confidence.

Did everything I needed it to

These are always accurate and you can store the solution in a cool dark place for months on end. At roughly 75 cents a pack to make 250ml its cost about $3 to make a litre which cost $14.99 at the hydroponic store. So you save $12 mixing your own.

works good

Kit ph

Cheapest option ive found so far, accurate and very easy to use. Don't waste it. You can store the solution for couple weeks.

Works as it should