A simple housing for a temperature sensor, designed so that it can be clipped to the headband on a head light. Made for use on a hard hat. There's a mount on the top for the sensor probe. Excess cable for the probe can be stored inside.

These are the temperature sensors I used:

5 Pcs Digital LCD Thermometer Temperature Monitor with External Probe for Vehicle Fish Tank Fridge Freezer Refrigerator Aquarium Brooders Climb Pet, Measure in Celsius
https://a.co/d/08S1t9US