FAO expert watching two local technicians calibrating pressure testing machine. This machine is used in the calibration of pressure valves and other pressurized equipment. - - FAO Technical Assistance to AGRITEX: ZIM/91/005/G/01/12. The FAO complex situated at Hatcliff, outside Harare, is the only one of its kind in South Africa, designed for testing all types of locally manufactured irrigation systems. At present all systems undergoing testing, are Zimbabwean manufactures.