HONEYWELL Ultraviolet UV Flame Sensor Detector Tube 129464M in combination with Theremino Geiger Adapter and PICAXE 08M2/AXE133Y OLED display
purpose : safety device for detection of flames
UV flame detector how it works see : "https://www.eetimes.com/document.asp?doc_id=1272315"
Theremino...