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§ 84.82 Gas pressure gages; minimum requirements.
(a) Gas pressure gages employed on compressed breathing gas containers shall be calibrated in pounds per square inch.
(b) Liquid-level gages shall be calibrated in fractions of total container capacity, or in units of liquid volume.
(c) Gas pressure gages other than those specified in paragraphs (a) and (b) of this section shall be calibrated in:
(1) Pounds per square inch; or
(2) In fractions of total container capacity; or
(3) Both in pounds per square inch and fractions of total container capacity.
(d)
(1) Dial-indicating gages shall be reliable to within ±5 percent of full scale when tested both up and down the scale at each of 5 equal intervals.