Elektron Technology's revenue fell to £17.9m in the six months to the end of July - down from £19.5m.
Underlying operating profit from businesses excluding Checkit was £1.1m (+ 22%) (H1 FY16: £0.9m).
Planned Checkit start-up losses were £1.8m (H1 FY16: £0.8m).
Operating loss (including Checkit) was £0.8m (H1 FY16: £0.1m) and loss attributable to equity shareholders was £0.1m (H1 FY16 profit: £0.3m).
Chief executive John Wilson said: "It is pleasing to report that, following the sale of Agar, the Group has returned a net cash position for the first time in many years and that further improvements to the underlying performance of its established businesses has been delivered, in spite of reduced demand, enabling investment in new products to be maintained. The Board believes this investment will lead to growth in the medium term."
At 8:51am: (LON:EKT) Elektron PLC share price was 0p at 6.88p