Classic circular dual-pen chart recorder with wind-up clock movement (no power needed). Tracks temperature and humidity over time using bimetal and hair sensor mechanisms.
Marked “USAF” – likely military issue. Appears to be in excellent working condition with smooth ticking and intact recording system. Great for collectors, labs, or display.
📏 Measures temp & barometric humidity
🔧 Mechanical wind-up operation – no batteries
📦 Local pickup or careful shipping available
Open to offers.