We describe an autonomously recording barometer which can resolve ambient atmospheric pressure variations for signal periods longer than 30 seconds, operates on a single Lithium D-cell battery for 6 months and maintains absolute time by synchronizing with the DCF77 radio clock signal available over much Europe. Its weight is 180 g and fits into a 500 ml twist top jar. The barometer should be well suited for research in meteorology and geophysics.
Rudolf Widmer-Schnidrig (Thu,) studied this question.