STELZNER® agricultural measurement systems

Measuring in soil and in liquids, with our MULTI ISE for determining individual nutrients and the Pockettester for pH, conductivity and temperature


The pocket tester for pH, conductivity and temperature

The Combo pocket tester can take simple and speedy measurements of all key parameters, including the pH, the conductivity (EC or TDS) and the temperature. Temperature compensation is carried out automatically for the pH and EC/TDS measurements. The user can specify the EC/TDS factor between 0.45 and 1.00. The temperature coefficient (ß) can be set in a range from 0.0 to 2.4% per degree Celsius. The HOLD function can be used to keep a measured value on the display. The Combo is housed in a water-proof enclosure and features a large double display. The pH electrode can be swapped out by the user. The EC/TDS probe is very resistant to salt and other aggressive sample mediums.


TDS (total dissolved solids) indicates the sum of the dissolved salts present in a solution. The TDS value is closely related to the conductivity value. The total amount of nutrient salts present in the irrigation water influences the capability of the roots to absorb nutrients. It also has an enduring effect on plant growth. For these reasons, it is important to check the TDS content regularly.

30003900 Combo € 214,20
pH/EC/T pocket tester with pH 4, pH 7 and 12.88 mS/cm solutions
Art.-Nr. Article Accessories Cart
30001305 Calibration solution, 12.88 mS/cm, 20 ml bag € 3,57
30003005 pH 4.0 buffer solution 20 ml bag € 3,57
30003006 pH 7.0 buffer solution 20 ml bag € 3,57
30003009 Spare pH electrode for the pHep 4/Combo € 80,92
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Measurement range:
Conductivity: 0 to 20 mS/cm
TDS: 0 to 10 ppt (g/L)
pH: 0 to 14
Temperature: 0 to 60 °C

Conductivity: 0.01 mS/cm
TDS: 0.01 ppt
pH: 0.01
Temperature: 0.1 °C

Accuracy:    Conductivity, TDS: ± 2% of measurement range
pH: ±0.05
Temperature: ± 0.5
Display: two-character LCD display
Operating temperature:

0 to+50 °C 

Power supply:
Four 1.5 volt batteries
Service life:
approx. 100 hours
Dimensions and weight: 163 x 40 x 26 mm, approx. 85 g
Special features:
EC/TDS selectable from 0.45 to 1.00
Temperature coefficient ß selectable 0.0 to 2.4 %/°C

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