The Predictor accurate meteorological grade barometer was built to stand the test of time and made to withstand the toughest conditions Mother Nature provides. Predictor features a German-made, aneroid barometer movement with a pointer needle to indicate current barometric pressure over a scale of 28.5 - 31.5 inches of Mercury. Accurate to 0.16", Predictor is a fully self-contained instrument that requires no external sensor or power supply. This barometer makes an amazing one-of-a kind gift and comes with a 5 year manufacturer warranty.