Metal construction, flexible, finest probe, small enough to clip comfortably to a top pocket.
Length (overall): 16mm long (6 inches)
Length (flexible probe): 10cm (4 inch) long
Diameter at light:7mm
LED light (not replaceable, but they usually last 30,000 hours)
Takes four LR44 batteries, included.
Is it easy to use?
Yes, it's a torch.