LLC AI209-T Value Series PH20 pH Tester Combo Kit with 8 oz. calibration buffers (4,7,10), 4 oz. 3M KCL Storage Solution, Probe Cleaning Brush & CalPod Solution Holder

These PH meters are supposed to have water in the cap they must be kept moist. When I received it, it had zero water in the cap. This is why it would not calibrate properly or read properly. I am returning item.

I use this meter for cosmetic formulation. It’s accurate for water-based solutions, but if testing viscous creams, conditioners, especially anything cationic (formulas with BTMS, CETAC, etc.): the meter will often freeze at pH 3.9 no matter what you do. This happens because the probe is being coated and losing contact with the sample. Solution: Always test a 1 : 10 dilution with distilled water. After use, rinse with water and soak 10 min in 1 : 1 vinegar + water and store in KCl solution. Calibrate once a week. Once you follow the steps, readings should be accurate. It’s a good tool, but requires some maintenance for creamy products. Without proper cleaning, it looks like every batch is pH 3.9 which might waste a lot of your time and calibration buffer solution troubleshooting.

Value is for sure the main factor. I have used it for a few months on a every couple of days basis and it's worked wonders. Only calibrated once upon arrival and once after 50-75 uses. I wish the sensors were replaceable just in case something ever did happen BUT I suppose that's fair due to the price in relation to the next model up. I use mine for plant feeding and I use very little nutrients or additives with reverse osmosis water and I would advise you be patient for the reading and giving it a minute or two to stabilize. I've only needed to do this with reverse osmosis water because of I believe the lack of particles in the water for a more prompt/accurate reading. This is fair and mentioned in the manuals also. In those situations a little shake and wait for it settle is wise. I know it's not due to the meter because before and after reverse osmosis water tests if I put the pen into PH 7.0 test solution it's almost instantly reading exactly 7.0. I love the test rack it comes with because you can reuse sooooo much of the test solutions. As novel as it looks and not of potential value to some but I found it to be of massive value because of the test solution cost savings but furthermore, mostly because the tray is perfectly fitted for the knock of the test pen and holds it in very stable positions. It also feels that it's weighted just right once the chambers have some solutions in the to hold the pen without hight likelihood of a tipping over test pen while in tray. I love the case it came with, very tidy and Profesional. My constructive feedbacks are (aka I wish it could or had this). -Backlight for digital display -Set desired PH target figure or PH desired range figure. Be notified on display or with audio once those set values are reached. More clear instructions on how to store both short term and long term without use to preserve sensors while not in use. Finally a spare washer or two for the pH pen and liquid sample capsule contact around the neck of the pen. (plastic seals can stretch a minute amount during use over time and possibly leak some of the storage solution provide. My only challenge with the order was that my storage solution cap was not well fastened and slowly dripped into the box and almost half the content was unfortunately lost. On a interesting side it appeared as though the solution leaking eventually dried and created a bond to the bottle and prevent added leaks and loss of product. Last but not least the black "fill" to line on the test liquid cup washes off promptly likely due to chemicals being tested. I used a piece of scotch tape to replicate the fill level line without it washing off again and resolved the challenge with ease. Summary, if you are good with unit and gently clean, store it right and be gentle then you have a very reliable, accurate and Profesional grade unit I would highly recommend.

these work well & will outlive 10 or more of the cheapo type. well worth the money.

Je recommande cet appareil. Il est facile à utiliser et précis.

First time user... Love this kit!! Highly recommend!! Fast, simple & accurate 3 points calibration. Excellent video links on the Amazon site & printed direction in the case to help your step right through the he process of calibration and use. 😎