SM150 Kit

    How to Buy
Moisture measurement kit with carry case Zoom
Sensor with HH150 soil moisture meterSM150 Soil Moisture KitSoil Moisture MeterSM150 Soil Moisture Measurement Kit


"Just to let you know that I’ve been delighted with the performance of the SM150T soil moisture sensors and accompanying GP2 data logger. They have been in action at an escarpment site in Iceland over a 2 year period - and have provided some extremely useful data." Nick Cutler
Lecturer in Physical Geography
University of Newcastle
"Working with Delta-T Devices, we installed two arrays of SM150T soil moisture sensors at varying depths - in selected well-managed plantations in the Santa Marta region of Colombia.

Choosing equipment that you have complete trust in to record the data you need, and, importantly, technical backup when challenges arise, were fundamental requirements for us. When you are running out of time (and daylight) in a remote banana field it was reassuring that someone at Delta-T was responding so quickly to our technical questions.

The Delta-T devices kit has been first class – it has not missed a beat since we installed the equipment. We now plan to leave the SM150T sensors in-situ after the project to continue developing our understanding of the soil-water fluxes under banana crops."
Prof Jerry Knox
Cranfield Water Science Institute,
Cranfield University, UK
"We used the instrument for 4 days of intense field work at 15 conservation areas across the Greater Toronto area - more than 200 readings per day. The sensor proved to be an invaluable asset to our research project. It is fast, light weight and very energy efficient." Nao Ito, Graduate Student
York University, Toronto
  • Complete low-cost kit
  • ± 3% accuracy
  • Portable and easy to use

The SM150 Soil Moisture Kit provides an affordable and easy-to-use tool for obtaining reliable moisture measurements with minimal soil or substrate disturbance.


The kit comprises an SM150T* Soil Moisture Sensor, a dedicated readout meter and a carry case. The cable and connector are watertight – an essential requirement for potentially wet environments.

The meter displays volumetric water content (% volume). Please note that although the SM150T Sensor has a built-in temperature sensor, the meter does not measure or display temperature.

Simple operation

The meter is lightweight and is very easy to use, being a readout-only device (no data recording or PC complications). Operation is simple – just insert the SM150T into the soil or substrate and press the Read button to make a reading.

Horticulture applications

The SM150 Kit comes with substrate calibrations for mineral, peat mix, coir, mineral wool and perlite (plus also provides raw voltage output) – providing a rapid, rugged solution for checking the uniformity of growing conditions for many types of growing media.

The SM150T is easy to insert and install – its sharp pins minimise soil disturbance and preserve the original soil structure around the measurement rods.

Other Delta-T soil moisture kits

Two alternative Delta-T Devices moisture measurement kits are available if greater accuracy or electrical conductivity (EC) measurements are required.


*The SM150 Kit was previously supplied with the SM150 Sensor, but now comes with the SM150T Sensor.





Measurement Volumetric water content and soil temperature
Accuracy ± 0.03 m3.m-3 (3%)
With soil-specific calibration
± 0.5°C (0 to 40°C for temp sensor)
± 0.75°C (-20 to +60°C for temp sensor)
Soil moisture measurement range Full accuracy over:
0 to 0.7 m3.m-3
Full range : 0 to 1.0 m3.m-3
Salinity range 50 to 500 mS.m-1
Salinity errors < 0.035 m3.m-3 from 0.05 to 0.4 m3.m-3. Can be calibrated up to 2000 mS.m-1
Temperature range Full accuracy over: 0 to 40°C
Output 0 to 1.0 V differential
Corresponding to 0 to ~0.6 m3.m-3
Resistance 5.8Ω to 28Ω for temp sensor
Power requirement 5-14 V, ~18 mA for 1s
Minimum 5 V with 100 m cable
Environmental IP68 (-40 to +70°C)
Sample volume ~55 x 70 mm diameter
Sample volume is weighted towards soil immediately surrounding the rods
Dimensions and weight Overall: 143 x 40 mm diameter
Rods: 51 mm x 2.5 mm diameter
Weight: 0.1 kg (exc. cable)
Sensor calibrations Individual sensors are interchangeable
Recalibration advised every 3 years (depending on use)
Soil calibrations Mineral, peat mix, coir, mineral wool, perlite - and also raw voltage output
HH150 Meter
Accuracy 0.5% of full scale over 5-40 °C (±7.5mV – negligible effect on SM150 accuracy)
Resolution 0.1% of voltage reading
Battery life/standby life 2 x GP alkaline AAA/ 10000 readings/1 year
Environmental Non-condensing
Compliance CE, FCC & ROHS




Main components and software

Mountings and enclosures

Installation accessories

Cables and networks

Remote communications

Spares and consumables

Power options


Product Resources

Data Sheets

Case Studies




Regulatory Information