Contact devices used for measurement of level

Q.  Contact devices used for the measurement of level are
- Published on 15 Sep 15

a. Less reliable then devices which does not make contact with the material
b. More reliable then devices which does not make contact with the material
c. Less reliable then devices which makes contact with the material
d. More reliable then devices which makes contact with the material

ANSWER: Less reliable then devices which does not make contact with the material

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