(ShareCast News) - Shares in touch-sensor manufacturer Zytronic were down almost 7% as the company's first-half revenue slipped lower, although its pre-tax profit and interim dividend for the period improved.Pre-tax profit was up 8% to £1.8m, from a profit of £1.6m, while interim dividend was hiked 10% to 3.45p a share, from 3.14p. Group revenue slipped to £9.9m from £10.0m.The company's Touch revenues accounted for 84% of the total, from 80% a year ago."The second half has so far experienced a similar trend with Touch product revenues continuing to increase relative to the traditional products," said chairman Tudor Davies in a statement."The consequent improved margins from this change in mix and the move towards the more niche larger touch sensors," Davies said.