Do you know What is relationship between atmospheric pressure and fishing? When is the perfect fishing time? How to find more fun from fishing? This digital fishing barometer is professionally designed for fishing-enthusiasts. It can increase successful fishing chance and bring more fishing funs for you. It has been known that the atmospheric pressure effects fish activitit; Dissolved oxygen of water is high under high atmospheric pressure fish will be active and has good appetite or fish will be dispirited and has a bad appetite. If we know the trend of barometric pressure it can greatly increase the chance of successful fishing. Main function: Altimeter barometer thermometer and correction fishing time remind function pressure tracking function for 6 fishing places fishing data recording 3days history data recording alarm stopwatch counting down storm alarm hour minute second month date display; 30m waterproof.