TS EN ISO / IEC 17020, Impartial conformity assessment of various types without sectoral distinction
is an international standard prepared to determine the general criteria for the qualifications of inspection bodies and to improve the confidence in inspection bodies.

TS EN 17020 HEAT METER GENERAL EXAMINATION PROCEDURE
TS EN 17020 HEAT METER INSPECTION INSTRUCTION
TS EN 17020 SENIOR MANAGEMENT LIABILITY STATEMENT
TS EN 17020 PROCEDURE FOR THE MANAGEMENT OF COMPLAINTS AND APPEALS