This little pocket forecaster, only 2” in diameter, is remarkably reliable for predicting general weather conditions in & around the British Isles in conjunction with a pressure reading from a barometer, & was a favoured instrument 90 years ago. Based on established meteorological principles, it is easy to read & inexpensive. made from solid brass with a clear acrylic centre disc, the detailed tables & readings are acid-etched & picked out in black paint. In leather carrying case with instructions. Works in UK only.