PROVING TANKS PROVING TANKS Changes not yet applied. Later legislation changes this provision in ways not yet written into the text below: Sch.3, 1st Table amended by Measuring Equipment (Capacity Measures) 1994 reg.3(a) Sch. 3 words substituted by Weights and Measures (Metrication Amendments) 1994 Sch. Pt. 2 Sch. 3 Table words inserted by Measuring Equipment (Capacity Measures) 2001 reg. 3(a) The permitted limit of error on proving tanks shall be 0.02 per cent of the nominal capacity. PROVING TANKS