• small datalogger MicroLog SP3 with three soil water potential sensors
  • SWP measured by Delmhorst Gypsum block or Watermark sensors
  • built-in datalogger temperature sensor
  • low maintenance, easy installation and set-up
  • large logging capacity and long battery lifetime
  • infrared wireless data access
  • Mini32 software support


Memory size 256 kB
Measuring range 0 to 35 kOhm (0 to –1.44 MPa)
Resolution 16 bits
Measuring intervals 10 min to 4 hrs
Memory capacity with measuring interval 1 hour ca 1.5 years
Battery life with measuring interval 1 hour ca 2 years
Internal temperature accuracy ± 0.3 °C
Protection rating IP68
Size of datalogger (diameter x length) 70 x 52 mm (incl. connectors)
Weight 110 g
Operating temperature  –40 to 60 deg. C
Operating humidity 0 to 100%

Soil water potential sensors

Micro Log S P 3 sensors Delmhorst Watermark
  • absorbs or releases moisture from the soil, until its moisture content approaches equilibrium with the moisture content of the soil
  • for irrigation purposes is important amount of water which can be extracted from the soil by the roots of the plants, and not only volumetric water content

Delmhorst conversion graph

Meter Readings

Mini32 software

Mini 32 overview
  • graphically oriented software intended for work with long time series
  • fast calculation of hourly, daily, montly values
  • fast brief statistics
  • built-in efficient commands for summation and min-max-average calculation


documentdocument 2 Datasheet
documentdocument 2 Battery replacement instructions


Compatible sensors

Main parts