Atago Digital Waterproof Pocket pH Meter.
pH Range: -1.0 to 14.0pH, ±0.1 pH (resolution 0.1 pH)
The Economical DPH-2 features up to 3-point calibration and a non-replaceable single-junction electrode.
Includes: Four 1.5V button type batteries and instructions.
 

• Easy-to-read display with an easy-to-afford price!
• Ergonomically designed LC display means measurements can be seen at a glance.
• Economical and easy to use.
• Waterproof and dustproof housing designed for use in dirty and damp field conditions.

Simply dip and read - the orientation of the display means no need to turn your head or tilt the tester. This low-cost meter is perfect for most applications. The single-junction electrode is recessed to protect against breakage. The unit offers up to three-point calibration with auto-buffer recognition for quick calibrations, automatic temperature compensation for accurate reading under changing conditions, hold function to lock measure value, and auto-off to prolong battery life.