Match the following columns:

Column I (Methods of measuring soil moisture)	Column II (Useful range kpa)
a. Tensiometer	1. 0 to < -1500
b. Resistance blocks	2. 50 to < -10000
c. Neutron scattering	3. -100 to< -1500
d. Pressure membrane apparatus	4. 0 to -85

Tensiometer is used to measure head and pressure in the unsaturated zone in the soil. Its range is between 0 to -85 kpa.

A resistance block is a soil moisture block often referred to as a gypsum block or electrical resistance block, which is a device for measuring soil moisture changes. Its range is in between -100 to < -1500 kpa.

Neutron scattering is the technique of choice for condensed matter investigations to measure soil moisture. Its useful range kpa is 0 to < -1500 kpa.

Pressure membrane apparatus is used to determine soil water retention and suctions greater than 0.4 bar, and its useful range is 50 to < -10000 kpa.