A must have for checking pH measuring tools. Solution or "buffer" is always at 7.0, so when you use your meter, you check it with the solution first and get an accurate 7.0 measure. If your meter measures otherwise, you can use the 7.0 solution to adjust your meter so that when you test your pool, hydroponics reservoir, or fish tank, you'll get an accurate reading. 

Convenient one use packets make testing your equipment efficient and affordable. We bundle the packets in a 2 count so you can save!