Bluelab pH Meter 

The Bluelab pH Meter is used to accurately measure the pH value of nutrient solution. 

This reliable pH meter is easy to use - simply place the pH probe into the solution and the reading will be displayed on the screen.

The Bluelab pH Meter incorporates two AAA batteries, making it completely portable. It can be used anywhere, at anytime.

Calibrate by using the push buttons on the meter and fresh calibration solutions - simple.

The Bluelab pH Meter features:

Auto turn off function
Large 1/2" digital display for easy reading
Low battery indicator
Light weight and portable

Carries a 5 year Bluelab Guarantee. Two AAA batteries included.

More info from the Manufacturer (PDF format - Lots of detail.)