Introduction

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.

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

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

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