Worlds most advanced pH, temperature tester with date & time stamp and 50 memory data points.

Add this item to your custom quote page by clicking the above "add to quote" button.


VisionPlus pH618N is the successor of the popular pH618N advanced pH tester with IP67 body, temperature readout, 50 data point storage, menu driven operation and replaceable electrode module. VisionPlus pH618N takes useful features typically found in larger, portable meters and packed them into a small, easy to use package.  Available in two different models: one for degree Celsius temperature readout and one for Fahrenheit temperature readout.VisionPlus pH618N is RoHS compliant.

  • Graphical LCD provides on-screen menu selection for manual-free, easy operation.
  • On-screen messaging displays useful information such as meter status, buffer selection and operation modes. no more guess work involving cryptic indictors or flashing digits.
  • 50 memory storage of both pH and temperature readings with memory location id and date and time stamp.
  • 4-button keypad provides intuitive operation with separate buttons for data hold, calibration, data memory storage and memory retrieval.
  • IP67 rated, water-proof dust-proof body.
  • Glass bulb electrode exposes more measuring surface to solution for fast response time.
  • Surface mounted temperature element improves temperature accuracy and response time.
  • Indicates exact date and time of last calibration so users can decide optimal maintenance schedule.
  • Real-time date and time display.
  • Clear LCD displays pH and temperature at the same time, along with meter status, calibrated buffers, status, date and time.
  • Large temperature range for wide range of applications.
  • 1,2, or 3 point calibration, with automatic buffer recognition of us and nist buffer sets.
  • Calibration data is stored in memory, ready for use on power up, even when batteries are removed.
  • Readings are automatically compensated for temperature (ATC).
  • Data hold for convenient reading.
  • Watertight case is ideal for rugged use. protective cover for pH electrode is included.
  • Replaceable electrode module ensures extended usefulness.
  • Belt clip which also attaches to neck strap.
  • 1 year warranty.


pH Range
0.00 to 14.00 pH
pH Resolution
0.01 pH
pH Accuracy
±0.02 pH ±1 LSD
Temperature Range (°C)
0.0 to 99.9 °C
Temperature Resolution (°C)
0.1 °C
Temperature Accuracy (°C)
±0.3 °C
Temperature Range (°F)
32.0 to 211.8 °F
Temperature Resolution (°F)
0.2 °F
Temperature Accuracy (°F)
±0.6 °F
pH Temperature Compensation
Auto from 0.0 (32.0 ℉) to 99.9 °C (211.8 ℉)
pH Buffer Recognition
Selectable (4.01,7, 10.01) or (4.00,6.86, 9.18)
pH Calibration
1point, 2 points or 3 points
Input Impedance
>1012 Ohms
pH Calibration Backup
Data Storage Capability
50 sets
Auto Shutoff
After 10 minutes of inactivity.
Power Supply
4 x 1.5 v batteries
End Point Sensing & Hold
98 x 64 mm graphical LCD
IP67 water-tight case
200 × 44 × 25 mm
Ambient Temperature Range
0 to 50 °C
105 g

Documentation and Supports