Skywatch BL vs Pascal Barometer

The Skywatch BL is a complete weather station connected to your smartphone via Bluetooth Low Energy (BLE) and uses the Bluetooth Environmental Sensing Profile (ESP). Measurements are transferred to your smartphone and may be viewed or uploaded and stored online. This application supports the BL300, BL400, BL500 and BL1000: BL300: wind speed, temperature, humidity BL400: wind speed, temperature, humidity, pressure BL500: wind speed, temperature, humidity, pressure, UV index BL1000: wind speed, wind direction, temperature, humidity, pressure General features: • Real-time measurements • Graphical display of measurements • Measurement history • Display of measurements on a map • Wind speed units: km/h, m/s, fps, mph, knots, Beaufort • Temperature units: °C, °F • Pressure units: hPa, mbar, inHg • Modes: instant, minimum, maximum, average • Compatible Bluetooth Smart (BLE) 4.0 and newer. • Bluetooth Environmental Sensing Profile (ESP) and Environmental Sensing Service (ESS) • Online firmware update of the device • Menu languages: English, French Skywatch BL 300 features: • Windspeed • Temperature, wind chill • Humidity, dew point and heat index Skywatch BL 400 features: • Windspeed • Temperature, wind chill • Humidity, dew point and heat index • Pressure (QFE, QNH), altitude Skywatch BL 500 features: • Windspeed • Temperature, wind chill • Humidity, dew point and heat index • Pressure (QFE, QNH), altitude • UV index BL1000 features: • Windspeed, wind direction • Temperature, wind chill • Humidity, dew point and heat index • Pressure (QFE, QNH), altitude

Track atmospheric pressure and predict weather changes using your device's built-in barometer. Pascal transforms your iPhone and Apple Watch into precision barometric instruments. Monitor pressure trends, receive storm warnings, and get weather predictions — all computed on-device with no internet required. FEATURES • Real-time pressure monitoring with 12-hour trend charts • On-device weather forecasting using the Zambretti algorithm • Storm alerts via push notifications • Live Activities showing pressure on Lock Screen and Dynamic Island • Flight mode with cabin altitude tracking • iOS widgets (small, medium, large) and Apple Watch complications • Hybrid calibration system for accurate readings PRIVACY FIRST All data stays on your device. No accounts, no cloud sync, no tracking. Location is used only for GPS altitude calibration and is never stored. TECHNICAL Pascal uses Apple's Core Motion framework to access the barometric sensor, delivering sub-Pascal resolution. The hybrid calibration system combines GPS altitude with relative altitude tracking to filter out elevation changes and surface true weather signals.