| http://www.w3.org/ns/prov#value | - The casing is suitably sealed in such a manner as to restrict, and preferably prevent, fluid entering between the body and the casing. [0014] The casing is suitably translucent and is preferably substantially transparent. [0015] The graduation means may comprise graduation markings applied directly to the body, preferably to the exterior surface thereof, by any suitable means.
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