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DS1631 / DS1621 I2C temperature sensors
Platinum wire resistive sensors
±0.03 to ±0.15 °C accuracy
Geiger Mueller Tubes - Handy for people looking to make random number generators or detect radiation. Tubes tend to be Cold War old stock from Russia/US, and tend to be used for detecting Gamma and Beta radiation. You'll need a high voltage boost supply - check nixie tube projects for some HV supply designs