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.
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.
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.
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||Generalised Mineral and Organic soil calibrations are supplied|
|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|
|Compliance||CE, FCC & ROHS|