The 8689 Digital PH Pen is one of the most popular types of PH Meters manufactured by Reed that offer an adequate pH Range: from 0.00 to 14.00 pH. Comes with great features such dual display of temperature and pH or automatic temperature compensation. With its one touch calibration for up to 3 points Reed 8689 assures that readings are corrected for temperature offsets.

• Dual displays of temperature and pH
• °F or °C temperature measurement
• Automatic temperature compensation assures that readings are
  corrected for temperature offsets
• One touch calibration for up to 3 points
• Calibration values are adjustable
• Data hold
• Electrode status indication
• Replaceable pH electrode module
• Waterproof housing (IP65)
• Low battery indicator
• Auto power off after 20 minutes of inactivity
• Protective sensor cap keeps sensor moistened