Electronic actinometer, radiation sensor, pyranometer, set in demonstration stand (museum?), by Skye Instruments Ltd, Llandrindod Wells, Wales, 1999. With instruction leaflet. Electronic actinometer, pyranometer, radiation sensor, Welsh, 1999 1999
Skye air pressure sensor with electronic readout, digital meter and power supply, Skye Instruments Ltd, Llandrindod Wells, Powys, Wales, 1999 Digital air pressure sensor, 1999 1999
