put forward Sadly Piping low temperature sensor party Auckland The above
Sensor for extreme low & cryogenic temperatures
Winland Temp Alert Preset Low Temperature Sensor
Amazon.com: WiFi Temperature Sensor Smart Thermometer: Digital Temperature Monitor Gauge with Waterproof External Probe, App Alert & Buzzer Alarm, Rechargeable Battery, for Freezer, Refrigerator, Fish Tank : Home & Kitchen
Pt100 / Pt1000 ultra low temperature sensor
Industrial Grade Wireless Temperature Sensor System for Ultra-Low Temperature Freezers - Phase IV Engineering Inc.