8oz. pH Calibration Buffer Solution Kit (pH 4.00 & 7.00), plus 4oz. 3M KCL Storage Solution for pH/ORP Electrodes

Well packaged and excellent price.

Seems to be a good quality product

All lids not tightened. Storage solution lid really loose; seal broken causing liquid to escape and run down the bottle, crystallizing around mouth and down sides. Noticeably lower liquid volume in bottle.

I assume these are accurate - my meter seems to calibrate just fine, but for some reason these have a terrible odor to them. My previous sets of calibration solution from other manufacturers never had any odor. I don't know why/what this smell is but to me, it's terribly obnoxious. I would not recommend it for that reason.

Had an older model Ph-80 that sat in a drawer for a year and had a dried out wick, Soaked it in the storage solution for 20 min cleaned it with distilled water calibrated first with 4.0 and it hit dead nuts then the 7.0 same thing. Fahrenheit was right at 67.0 degrees and I was happy I know these solutions are expensive and I don’t know why but it was the best deal on Amazon and it worked for me your mileage may vary but I had to give a positive review. The only thing I didn’t like is it was shipped in a Bag not an over Box for protection and I hate that for sure come on Amazon.