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GRYF 259 - pH meter, mV meter, thermometer

Processor handheld measuring instrument for pH, mV and temperature measurement.

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Processor handheld measuring instrument for pH, mV and temperature measurement.

GRYF 259 is a microprocessor-controlled, battery-operated measuring instrument. A device designed to measure pH, electrical voltage and temperature. Its ergonomic shape allows one-handed operation, so it is suitable not only for laboratories, but also for field work and operations. The device is controlled by four buttons that are similar to the PC: use arrow keys UP, DOWN, ESC, ENTER. The multifunction display (LCD) clearly displays all measured variables and other accompanying data and messages. The display shows the main measured value (conductivity, pH or mV) and the accompanying temperature variable.

GRYF 259 is equipped with an ORP measuring capability or with different ISEs to measure ion activity.



The pH measurement function is equipped with automatic temperature compensation, ie. when measuring the pH (displayed on the display), the temperature used for calculating the final displayed value is measured at the same time.

Any single or combined pH electrode can be used to measure the pH. An electrodes for measuring ORP or different ISE can be connected to the mV meter input.

Two-point pH meter calibration can be performed at different preset pH values ​​of the calibration solutions. After the calibration has finished, the instrument evaluates the pH of the electrode.   

If the device is equipped with a voltage output, the measured data can be transferred to another device (eg. recorder).

The device is powered by a 9V battery. A drop in its voltage is indicated by the "Bat" message. The automatic shutdown is set to 5 minutes. The auto power off function can be turned off. 



PH measurement range, resolution 0 – 14 pH; 0.01pH
Accuracy of pH measurement±0.01 pH ±1 dig.
Input resistance for pH10 12W
Temperature compensation for pHautomatic  0 – 100oC
Temperature measurement range, resolution-50 – 200 oC; 0.1 oC
Accuracy of temperature measurement±0.2 oC ±1 dig
Temperature sensorNi 1000, 6180 ppm
Measuring range mV, resolution±1500 mV, 1mV
Measuring accuracy mV±1mV ±1 dig.
Voltage output1dig = 1mV
Power supply9V, baterie typ 6F22
Battery life280h (continously)


GRYF HB, spol. s r. o. is a manufacturer of multi-functional measuring instruments used for measuring electrochemical and physical values such as pH, temperature, conductivity, oxygen, redox potential.

Where to find us

GRYF HB, spol. s r.o.
Cechova 314, 580 01 Havlickuv Brod

Na Tisine 1396, 580 01 Havlickuv Brod

Opening hours: Mon-Fri 7:00 -- 15:30


We launched the IFFMan fish farm automation application this year. Our products are necessary devices in the configuration process, where everyone simply builds their farm and then controls it conveniently from a mobile phone or computer.

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+420 569 425 024
+420 602 468 083