SM150 Soil Moisture Kit

Complete low-cost kit± 3% accuracyPortable and easy to useThe SM150 Soil Moisture Kit provides an affordable and easy-to-use tool for obtaining reliable moisture measurements with minimal soil or subs

  • Product Name:SM150 Soil Moisture Kit
  • Model:SM150
  • Maunufactor:Delta-T
  • Country:UK
  • 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 HH150 Moisture Meter and a carry case. The cable and connector are watertight – an essential requirement for potentially wet environments.

The HH150 Meter displays volumetric water content (% volume). Please note that although the SM150T Sensor has a built-in temperature sensor, the HH150 Moisture Meter does not measure or display temperature.

Simple operation

The HH150 hand moisture 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 perlite, coir, peat, and mineral wool, as well as soils – 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.

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


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    Generalised Mineral and Organic soil calibrations are supplied

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