Measure temperature and humidity at the cliff. 

A reliable sensor built into a small durable case with a convenient clip point for hanging on a pack. Accessory carabiner is included. Powered by two LR44 batteries (included), which last about one year, and then are easily replaced. Must be in the shade to read accurately.

A fun way to learn condition patterns throughout a session, correlate to the “in-town” forecast, and better plan the next session.