How to Buy
WET Kit - including WET Sensor Zoom
WET Kit – with carry case and HH2 readout unitWET Sensor – measures moisture, EC and temperatureWET SensorWET Sensor in substrate block


"As a progressive agriculture consultancy we've been using the WET Sensor in multiple Indian open-field and hydroponic research projects over the last two years. We've found the sensor to be very robust and easy to use - and the readings it provides to be extremely accurate and consistent. Having extensively tested the sensor across a number of agri-climatic zones, we can happily endorse this instrument as a high quality research tool - that is ideally suited to extreme conditions." Chetan V Dedhia
CVD Solutions
Mumbai, India
"Optimising the quality and yield of our fruit is a key priority for Clock House Farms. By knowing the exact EC and moisture levels hour by hour we have the data that enables us to react quickly to changing substrate conditions.

It is the immediacy of the data which the WET Sensor provides that is valuable to us, not just the excellent accuracy.

In terms of benefits that the WET Sensor provides, it not only gives us the confidence that we have optimal growing conditions at all times, it has also enabled us to reduce irrigation levels (whilst enhancing produce quality) - eliminating unnecessary water wastage and reducing expensive fertiliser costs."
Nick Deppe, Farm Manager
Clock House Farm, Kent, UK
"We have used the Delta-T Wet Sensor since its introduction. This device has allowed us to have precise control over the EC in our strawberry and raspberry substrate grown crops; delivering better quality, flavour and yields. We could not manage without this excellent tool now." Harriet Duncalfe
H&H Duncalfe, UK
"We've successfully integrated a large number of Delta-T Devices WET Sensors into our measurement systems. We use them continually - to provide EC, moisture and temperature measurements. This valuable data helps our customers to improve the yield and quality of commercial Cucumber and Tomato crops." Martin Drop
Hortitechnic, UK
  • Measures Water content, EC and Temperature
  • Complete kit with readout unit & case

For Commercial Horticulture use please click here

The WET Kit provides researchers with a powerful portable tool for assessing growing conditions in soils and substrates. The WET Kit measures and displays 3 important variables that influence plant growth: water content, temperature and pore water conductivity (ECp) – the EC of the water available to the plant.

The kit comprises a WET Sensor, an HH2 Moisture Meter (readout unit) and a carry case.

The WET Kit comes equipped with calibrations for generic mineral soils, organic soils, sand soils, clay soils, coir (coco fibre), peat based potting mixes, greenhouse ‘mineral’ soils, and Stonewool artificial mineral wool substrate (vertical and horizontal measurement).

Click here for details on the WET Sensor as a standalone device

Video – The Wet Kit’s use in commercial horticulture

WET Sensors used aboard China’s Tiangong-2 Space Station

The WET Sensor has been used by Chinese astronauts to conduct horticultural experiments in space. find out more.






Measurementvolumetric water contentPore water conductivityTemperature
Accuracy± 0.03 m3.m-3 (3%) see graph below ± 1.5°C
Soil moisture measurement rangeFull accuracy over:
0 to 1 m3.m-3
see graph below 0 to 50°C
Salinity range0 to 300 mS.m-1
Supplied with extended range calibrations which should be used for readings between 300 to 500 mS.m-1
Temperature range-5 to 50°C
OutputSerial TTL data providing permittivity, bulk conductivity and temperature, from which water content and pore water conductivity are calculated
Power requirement6-10 V, ~38 mA for 2.5s
Sample volume~500 ml
Sample volume is weighted towards soil immediately surrounding the rods
Dimensions and weightOverall: 120 x 45 x 13 mm
Rods: 68 mm x 3 mm diameter
Outer rods 68mm x 3.0 mm dia
Central rod 65 mm x 5.0 mm dia
Weight: 0.1 kg
Sensor calibrationsSensor calibrations supplied in WET Sensor EEPROM
Recalibration advised every 3 years (dependent on use)
Soil calibrations

Generalised Mineral ,Organic, Sand and Clay calibrations are supplied, specialist calibrations are available for horticultural substrates (please enquire at sales@delta-t.co.uk for more information) .

Wet Sensor chart




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




Technical Notes

Sensor Calibration File Locator

Input your 5 or 6 digit serial number below (do not include a slash or space) to download your WET Sensor calibration file. (Example: 28073 or 120055).

IMPORTANT: If your serial number only has 4 digits, for example 22/19 – please add a zero before the last two digits – i.e. 22019

The serial number can be found on the sensor’s blue cable label. Contact tech.support@delta-t.co.uk if your serial number is not recognised - and we will assist you directly.

    Results will appear here