1413μS/cm Calibration Solution Conductivity Standard Buffer Solution for EC Tester Hydroponics Meter 4 Bottles of 50mL

I got these simple test solution bottles to check and calibrate my tds meter, and so far they work well. The meter has read the solution accurately so it looks like both are in order. Having individual bottles simplifies things, and for simple checks periodically they seem to work perfect.

Every so often I have to recalibrate my hydroponic sensors and equipment. This is an inexpensive set to test and confirm your system still calibrates correctly. Good accuracy when compared to other tests. Quality isn't bad and you only get something like this if you truly need it, so it is functional and meets my needs.

These go along with a pool tester I ordered a few weeks ago. They are said to be 2-year shelf stable unopened, and are single-use bottles. They just allow me to double check my electronic tester from time to time.Although I don’t think I needed to test it since my unit is so new, I did open one bottle, and fortunately, my tester was properly calibrated. The instructions indicate to dispose of the tester liquid after doing the single test. Makes senseGood idea to have handy to check your tester 2x/year. This supply will then last for the 2 years before it expires.

I used this to re-calibrate my Truncheon Salinity Meter. Nice that they make this available as sometimes with these imported items, any sort of refill is difficult to get. I use the meter to measure salinity in a large freshwater aquarium so accuracy and proper calibration is important since the lower levels of freshwater are difficult to measure compared to high saltwater aquariums.

I’m using this to check caliber on some meters we use with our hydroponic garden and aquarium. The tiny bottles are great because this stuff should not be held long term after opening. We use about 25 ml for each calibration, so we get two uses per bottle.They are very tightly sealed and the results look good. With a new, factory calibrated meter I got 14.1 mS/cm, which is as good as that meter gets.My only concern is the lack of lot numbers or production/expiration dates. This isn’t lab grade stuff, but it would be nice to have a sense of how old this is.

Used these to help calibrate a linear-only HI 9033 meter. Post-calibration, it agreed with (<1% error) the other calibration solutions from this manufacturer across the full range, so these are indeed pretty accurate. These should do fine if all you need is a generic non-certified calibration done.

I have a hydroponic garden so it is critical to keep my EC tested calibrated to ensure a strong harvest. The UIUZMAR 1413μS/cm Calibration Solution was a great kit to ensure I can continue to get the most from my garden set up.The solution came in four 50ml bottles which had wide mouths and allowed for my meter to easily slot in. I appreciate that the solution came in four separate containers, so that I can use one and keep the others fresh for future use.The solution allowed me to quickly recalibrate the meter, so I was good to go! (I realized I didn't capture the final calibration moment in the image, so ignore the reading, I can attest the solution calibrates correctly)My only (incredibly minor) negative feedback is that the protective seal didn't have any form of easy open option, so I had to puncture the top with scissors to get the solution open, but at least it was sealed tightly.

Personally, I've never had a problem with unopened 1413μS/cm calibration solution going "bad" after 2 - 3 years, BUT they are supposed to be used within a year of manufacture. As other reviewers have noted there are no dates listed anywhere. I'm giving these 4 stars due to the price of sub $15 for 4 bottles. The bottles I received look brand new, so they were "probably" manufactured recently.