Hydo Axis PH Digital Tester for Hydroponics and Aquariums
Hydro Axis Pen testers are easy to use and portable, and the range includes both pH and EC meters. They are suitable for both hydroponic and aquarium users.

Specifications
Range: 0 – 14 pH
Resolution: 0.1 pH
Accuracy: + or – 0.1 pH
Typical EMC DEV Batteries: 4x 1.5V (AG-13 Button battery)
Life: Approx. 700 hours of use
Dimensions (mm): 150 (h) x 29 (w) x 15 (d)
Weight: 51g