Product tester Intertek posted an 'excellent result' for the first half and continues to see good trading in the majority of its businesses, in line with its expectations. The group said for the full year it expects to achieve good organic revenue growth, although it anticipates slower growth in the second half. Some of its volume related businesses (around 30% of Group revenues) have been impacted by lower global trade and costs have been aligned accordingly.Pre-tax profit for the half-year surged 49.9% to £87.7m on revenue that rose to £622.3m from £457.4m before. The growth benefited from the weakness of sterling against most of the currencies in which the Group operates, particularly in the first quarter of 2009. Organic revenue growth was 6.1% at constant exchange rates."Despite tougher global market conditions, the key business drivers to Intertek's global business remain intact, namely product variety, supply chain complexity, the outsourcing of in-house testing laboratories and increasing demand for safe, environmentally friendly and quality products driven by ongoing regulation and end customers," said the group.Interim dividend is up 15.5% to 8.2p.