Highly Stable and Accurate pH Readings with a Large LCD Display. Designed for Simple, One-Handed Operation.

Automatically calibrates to pH 4, 7, 10 buffers and can be adjusted to recognize non-standard buffers as well. These pH pens offer unbeatable solutions for applications such as waste-water, surface water, aquaculture, hydroponics, pools, and education. They each feature hold function, and auto power off with low battery indicator.

The cases are IP65 waterproof, and will float if accidentally dropped into the water. They come with 4 button-cell batteries and a built-in electrode kept moist with a protective cap.