NOUN (3)

1. a measuring instrument for measuring the moisture content of soil;

2. a measuring instrument for measuring the tension in a wire or fiber or beam;

3. a measuring instrument for measuring the surface tension of a liquid;

WordNet (r) 3.0 (2006):

tensiometer
    n 1: a measuring instrument for measuring the moisture content
         of soil
    2: a measuring instrument for measuring the tension in a wire or
       fiber or beam
    3: a measuring instrument for measuring the surface tension of a
       liquid