Many (but not all) of the soil moisture sensors discussed are connected to measuring
equipment using low voltage irrigation connectors. 3M® 316IR Scotchloks can be used
for this purpose. If you have not used Scotchloks before, the following notes will be of
use:

• Use one Scotchlok per connection, see picture below.
• If there are three holes - use one for a sensor wire and
  one for a measurement equipment wire - leave the third hole unused.
• Don’t strip the insulation from the wires to be joined. The metal plates inside the
  connectors work by displacing the insulation. Stripping the insulation will result
  in a poor connection.

Directions: 

Watermark sensors require to be soaked for 24 hours before installation 

1. Push one wire from the sensor cable and the relevant coloured wire from the
logger or field station into the connector as far as they will go. The connectors are
translucent on the side opposite the black button so you will be able to see when
the wires are all the way in.

2. Holding the wires in place, use pliers or multi-grips to push the black button on
the connector all the way down.

3. Repeat for all remaining connections.

4. After all the blocks are connected, ensure that the end of the logger cable is off
the ground and pointing downward so that water is not able to collect in the
cable. For added protection you can wrap the end of the cable or the join itself in
waterproof tape.