Breathing apparatus testing standards require periodic inspection, oxygen purity checks, and mandatory recordkeeping for rescue equipment. Specifies the procedure for testing breathing and resuscitating apparatus, flow meters and the purity of oxygen used in breathing apparatus. The standard applies to apparatus in rescue stations and rescue rooms and requires periodic testing of condition, leakage, cylinder pressure, relief valve discharge pressure, oxygen delivery rate and automatic demand valve operation, with records kept in bound or non-editable electronic form. Oxygen purity must be tested, and oxygen containing more than one per cent impurities must not be used. Apparatus testers must also be checked for accuracy at manufacturer-recommended intervals.