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HI9815 pH Turtle

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Hanna Instruments

 Product Description

The HI9815 pH Turtle is an easy-to-use transmitter that turns any PC into a pH meter. With no buttons on the unit, you simply plug it into a serial port within moments you can view pH measurements on your monitor. The software allows for continuous real time data logging right from the desktop. With a virtual pH meter display that continuously updates the logging data table and real-time graph.


  • Continuous real-time data-logging
  • Inexpensive desktop solution
  • Automatic calibration at 1, 2 or 3 points through PC
  • Supplied with HI 981500 Windows compatible software, RS232 connection cable (1 meter), HI 1333B pH electrode (1 meter) and instructions


  • Range: 0.0 to 14.0
  • Resolution: 0.1
  • Accuracy: ±0.2
  • Dimensions: 3.5" diameter x 1.6"
  • Weight: 250 g (8.8 oz.)

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 Product Reviews

  1. Best pH Meter for the price

    Posted by Baron Williams on May 5th 2016

    This pH meter is a real time saver.

    If you’re like me and you’re always logging your work on the computer, you’ll love the automatic logging feature! You can log everything including both high and low alarms, temperature selected, time and date, sample number, pH value, and even remarks. The logging speed (sampling interval) is user selectable in seconds. The maximum number of samples per log is user selectable. The current sample to start logging from is also user selectable. At any point in time you can enter remarks in the log file for a particular sample, while it’s running or not. This feature is fabulous. Let’s say you suddenly noticed a dip in pH, you can immediately enter the reason for the pH dip right there in the log while continues running and collecting more data.

    The temperature can be manually set in F, C, or K. The software will correct the pH for the current temperature entered. This is essential for accurate pH reading because temperature directly alters pH readings.

    The graph view allows you to visually see the pH changes that are occurring in real time. You can configure the look and feel of the graph, and figure the information it displays in the grid (sample number, interval time, actual time).

    The “Turtle” body plugs into the computer’s RS232 port. Both the probe and the “Turtle” are actually made to be water resistant. The “Turtle”, while not waterproof, is well protected from water spills with an internal rubber O-ring in its housing (I saw one opened up once). This is a very good design.

    The pH probe is a great probe for the price. The pH probe is a detachable probe with a standard connector. Using the software, it’s really easy to auto calibrate! Once you try it, you’ll never want to go back to manual calibration again! The auto calibration feature auto detects the buffer solution, so all you do it press a few mouse clicks, put the probe in 2 or 3 buffer solutions are you are DONE! And it doesn’t need to be recalibrated all the time either. It’s very accurate and keeps it’s calibration settings very well.

    I’m surprised by the quality of this product, and very impressed with the features it packs.

    This is by far the best pH meter for the price! I LOVE IT!

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