SCHEDULE 4 RELEVANT LIMITS OF ERROR FOR INSTRUMENTS IN SERVICE
Regulation 21(2)
The maximum permissible errors for instruments in service of a category to which a Directive mentioned in the first column of the following Table applies shall be the errors prescribed in relation to that Directive in the second column of the Table.
Directive	Maximum permissible errors in service
The Directive on medium accuracy bar weights and cylindrical weights.	The maximum permissible errors in excess set out in the tables in item 7 of Annex I and item 7 of Annex III to the Directive shall be the maximum permissible errors both in excess and in deficiency in the case of instruments in service.
The Directive on meters for liquids other than water.	The maximum permissible errors in deficiency for an instrument in service shall be the amounts determined in accordance with items 1, 2 and 3 of Chapter II of the Annex to the Directive and applicable both in excess and in deficiency on initial verification, and the maximum permissible errors in excess for an instrument in service shall be twice those amounts.
The Directive on the measuring of the standard mass per storage volume of grain.	The maximum permissible errors in service shall be the maximum permissible errors set out in the Directive.
The Directive on ancillary equipment for meters for liquids other than water.	The maximum permissible errors in service shall be those laid down by any one or more of the following provisions of the Annex to the Directive, that is to say– (a) item 4.9 of Chapter IV; (b) items 5.10, 5.13.1 and 5.13.2 of Chapter V; and (c) item 6.7 of Chapter VI which is applicable in the circumstances of the case.
The Directive on above-medium accuracy weights.	The maximum permissible errors in excess for class F2 and M1 weights in service shall be the maximum permissible errors set out in the table in item 4.1 of the Annex to the Directive and applicable both in excess and in deficiency on initial verification, and the maximum permissible errors in deficiency for weights of those classes in service shall be twice the maximum permissible errors in excess.
The Directive on cold-water meters.	The maximum permissible errors, both in excess and in deficiency, shall be: (a) 6 per cent., where the flowrate is between the minimum flowrate and the transitional flowrate; and (b) 2.5 per cent., where the flowrate is between the transitional flowrate and maximum flowrate. In this paragraph “minimum flowrate”, “transitional flowrate” and “maximum flowrate” have the same meanings as they have in the Directive on cold-water meters.
The Directive on measuring systems for liquids other than water.	The maximum permissible errors in deficiency for a system in service shall be the amounts determined in accordance with items 1, 2 and 3 of Chapter II of the Annex to the Directive on meters for liquids other than water and applicable both in excess and in deficiency on initial verification, and the maximum permissible errors in excess for a system in service shall be twice those amounts.
The Directive on hot-water meters.	The maximum permissible errors in service shall be twice the maximum permissible errors set out in the Directive, both in excess and in deficiency.
The Directive on tyre pressure gauges for motor vehicles.	The maximum permissible errors, both in excess and in deficiency, shall be: (a) 100 mbar, where the upper limit of the scale does not exceed 4 bar; or (b) 200 mbar, where the upper limit of the scale exceeds 4 bar.