H2O Sync pH/ORP Electrode Storage Solution 8 oz / 237 mL for use with pH Probes and ORP Probes to Extend Life

Great value

5 star product, deducted 1 star for Amazon shipping a squeeze bottle of liquid without any box.TL;DR. Cheaper than Apera 3M KCL and 8 oz should last a year. May pay for itself by requiring fewer calibrations or extending lifespan of probe.Amazon shipped it without a box, just bubble wrap envelope. Order at least one other item with same delivery date (so Amazon ships them together in a box).This is 3M KCl, just like Apera 3M KCL storage solution (AFAICT).Made in Texas, USA with two ingredients only: distilled water, potassium chloride.Bottle looks like the pictures on Amazon. Squeezable bottle with flip cap can pour one drop at a time.Got this for Apera PH20 pH meter which is used often. PH20 instructions say keep a few drops of tap water in the cap, but I don't think that's ideal.Storing probes soaked in 3M KCl can extend the probe's lifespan and require fewer calibrations (buy fewer probes, buy less calibration solutions).This 8 oz bottle should last a year for Apera PH20 & PH60 meters:1. Rinse probe with water and dry (shake off water, then use paper towel on plastic parts, avoid scratching bulb)2. Fill cap with about 4 ml of 3M KCl (it should fully submerge the bulb). Store probe with cap side down.3. Don't empty the cap daily. Just add extra drops if needed.4. Every week: clean out and dry the cap, then refill with 4 ml of fresh 3M KCl.If the pH of 3M KCL isn't correct, then double check using PH4 and PH7 calibration solutions before calibrating.

One bottle has lasted 17 months. Amazing. Simply the best because of the dispenser on the cap. Allows you to put the perfect amount and never waste a drop. Ohh an the price is exactly the same as 17 months ago. Thanks so much A++++

This is the second time I purchased this product. Product does what it is intended to do and is cheaper than most other pH storage solutions. I used to have cheap pH testers that needed to be sealed in a bottle in about 1/2" deep of storage solution because the caps that came with them allowed solution to evaporate with in 24 hours. It is often a week between uses. My new tester has a small, clear plastic cap that screws on with an o-ring seal, so it'll probably be a long time before I need any more.

Decent amount for the price and should last you a while. Definitely a good buy for anyone that needs storage solution for their ph meter/probe.*UPDATE*Lasted over 1.5+ years with some still left when I bought a new bottle to replace it before I finish the bottle. Works great and at a good price point. Store in a cool dark place.

I paired this storage solution with my entry level pH pen. It works as advertised. My pH pen stays in calibration much longer now. The fliptop cap is great for filling the small pen cap/reservoir. It makes it easy to squeeze out a few drops to refill the pen cap after each use.I will buy this storage solution again.

My pH meter was misreading, presumably because the KCl in the storage vial had been diluted. After soaking the probe in the fresh solution for 2 days, the pH began to read properly. I suggest that after measuring the pH of a sample that the probe be rinsed with distilled water and then with the 3M KCl before storing the probe in the 3 M KCl solution.

Package was wet and open when i got it cant say if it will be any good since it wasnt sealed.

Works as expected.