Tests required by this code, which
are performed utilizing dial gauges, shall be limited to
gauges having the following pressure graduations or
increments.
Required
pressure tests of 10 psi (69 kPa) or less shall be
performed with gauges of 0.10 psi (0.69 kPa) increments
or less.
Required pressure tests exceeding 10 psi
(69 kPa) but less than or equal to 100 psi (689 kPa)
shall be performed with gauges of 1 psi (7 kPa) increments
or less.
Required pressure tests exceeding 100 psi (689 kPa)
shall be performed with gauges of 2 percent increments
or less of the required test pressure.
Test gauges shall have
a pressure range not exceeding twice the test pressure
applied.