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 MULTI ISE for measuring the individual nitrate, ammonium and potassium components in soil solution and ions in aqueous solutions

OThe Multi ISE is the versatile, robust multi-purpose tool for measuring the ion content in fluids. No filtration or clarification of the measured solution is required. Turbidity or discolouration do not affect the measurement results.

You can use the MULTI ISE to determine the pH as well as concentrations across a wide concentration range for the following ions in aqueous solution:
ammonium NH4+, nitrate NO3-, potassium K+, sodium Na+, calcium Ca2+, fluoride F-, chloride Cl-, bromide Br-, iodide I-, silver Ag+, copper Cu2+, or nitrite NO2-.

This measuring instrument can measure contents in the mg/l (ppm) range, so there is no need to dilute the measured solution. The result is shown on the display in g/l with an accuracy of 0.001 g/l (1  mg/l). These concentrations can be determined with a precision level of ± 5 % of the measured value.

The MULTI ISE can also measure the individual nutrient ions most critical for agriculture: ammonium (NH4+), potassium (K+) and nitrate (NO3-). Measurements can be made in fertilizer solutions, soil solutions (extracts), plants and organic material. The nutrients can be measured directly in the fertilizer solution.
A simply slurry solution made with deionized water (or better yet, an extraction solution recommended by LUFA – the German Agricultural Testing and Research Institute) will suffice to determine the ion concentrations in substrata and soils.

An extraction solution consisting of alum KAl(SO4)2 is used for nitrate. For ammonium and potassium, an extraction solution of calcium chloride CaCl2 is used.

The MULTI ISE is microprocessor-controlled and easy to use. The corresponding electrode (ammonium, nitrate or potassium) is first connected to the instrument and then immersed together with the reference electrode into the solution being measured. The instrument references the on-board calibration data corresponding to that measurement.

The menu-driven calibration process is self-explanatory. The required calibration solutions and the technical manual are included in the kit.

The enclosure is waterproof (resistant to splashed water).

30001901 MULTI ISE € 797,30
Base unit without electrode
30001900 MULTI ISE advisory kit € 2023,00
with ammonium, potassium and nitrate electrodes and calibration solutions, refill solution for electrodes with filler syringe, conditioning solutions, powder for extraction solutions, spray bottle with deionized water and manual
Art.-Nr. Article Accessories Cart
30001916 Calibration solution 62 mg/l NO3, 100 ml bottle € 8,93
100 ml Flasche
30003019 One nine-volt battery € 2,98
One nine-volt battery, size 6LR61
30001004 Spritzflasche mit entionisiertem Wasser € 7,14
30001904 Calibration solution 180 mg/l NH4, 100 ml bottle € 8,93
30001905 Calibration solution 18 mg/l NH4, 100 ml bottle € 8,93
30001906 Calibration solution, 390 mg/l K, 100 ml bottle € 8,93
30001907 Calibration solution, 39 mg/l K, 100 ml bottle € 8,93
30001908 Conditioning solution for NH4 (1 mol/l NH4Cl), 50 ml bottle € 8,93
30001917 Calibration solution 620 mg/l NO3, 100 ml bottle € 8,93
other calibration solutions are available on request
30002024 Conditioning solution for K and NO3 (1 mol/l KNO3), 50 ml bottle € 8,93
30002027 Refill solution with filler syringe for electrodes, 0.1 mol/l KCl, 100 ml bottle € 8,93
30002035 Salt for 5 l extraction solution/alum € 11,78
30003035 ISE / reference cable, one metre € 44,03
40100006 Bromide selective electrode € 811,58
40102006 Calcium selective electrode € 844,90
40104006 Chloride selective electrode € 737,80
40106006 Iodide selective electrode € 827,05
40110006 Fluoride selective electrode € 910,35
40112006 Copper selective electrode € 868,70
40114006 Nitrate selective electrode € 773,50
40116006 Silver selective electrode € 773,50
40118006 Ammonium selective electrode € 743,75
40126006 Reference electrode, double bridge € 243,95
40134006 Potassium selective electrode € 806,82
40136006 Sodium selective electrode € 868,70
40138006 Nitrite selective electrode € 910,35
30000504 Calcium chloride (CaCl2) for soil analysis (approx. 11.1 g for 10 litres of 0.01 mol/l) € 5,95
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Measured quantities:

ammonium NH4, nitrate NO3,
potassium K, sodium Na, calcium Ca, fluoride F,
    chloride Cl, bromide Br, iodide I,
    silver Ag, copper Cu, nitrite NO2

Measurement range: to min. 10 g/l
Accuracy: ± 5 %
Display: LCD
Operating temperature:

During operations:
+5 bis + 45 °C

Power supply:

One nine-volt battery,
size 6LR61

Service life:

approx. 100 hours

Protection degree: IP40
Dimensions and weight:

125 x 75 x 45 mm,
190 g

Dimensions and weight with case: 460 x 350 x 135 mm,
    approx. 5.0 kg

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