pH pen (Bluelab brand)

This clever little handheld pen will help you manage the success of your crops. The pH pen provides a pH reading of the solution so you know that the nutrients will be made available to your plants. Comes with a 1 year limited written guarantee with proof of purchase.

Features:

- measures pH and temperature ( C or F)
- Automatic temperature compensation (ATC)
- Double junction probe (not replaceable)
- Successful pH calibration indicator
- Holding reading function
- Fully waterproof
- Low battery indicator
- Backlit LCD display
- Auto off function