Gear Test - Universal Fingerlight
This one is red with a blue LED...I also have a blue one with green LED.
It's pretty light and plastic...I guess it would take a bit of care in the field. I used to have more heavy duty ones (one white light, a red light, and one IR light) for when I flew...they weighed a bit more but were much sturdier. I don't remember the manufacturer, though.
Universal FingerLight from Walmart