B14 Glass Vacuum Heated Thermistor STC, c.1963 10KΩ @20°C Rare, Cool, Made in UK
£7.95
They comprise a tiny NTC thermistor of nominally 10kΩ resistance at 20°C, surrounded by a small coil of wire with ~100 ohm resistance, mounted in an evacuated glass tube. The coil is electrically insulated from the thermistor.
