CJMCU-390 BMP390L Digital Atmospheric Pressure Sensor, Compatible with BMP388 and BME280 The BMP390 pressure sensor delivers high accuracy for altitude measurement in smartphones, wearables, and ear-worn devices. With improved resolution, it detects altitude changes below 10 cm, offering 50% higher accuracy compared to previous-generation sensors. Precise altitude detection supports indoor positioning where GPS signals are unavailable. When combined with horizontal location data, it enables vertical positioning—such as floor-level identification—for emergency response applications. Typical relative accuracy: ±0.03 hPa; typical absolute accuracy: ±0.5 hPa. This performance is achieved through enhanced temperature stability, reduced drift, and lower noise. Operating temperature range: 0 °C to 65 °C. Typical temperature coefficient of offset (TCO): ±0.6 Pa/K. RMS noise: 0.9 Pa—25% lower than the BMP380. The sensor features high long-term stability and low short-term and long-term drift. Material: Plastic Color: Purple Package Includes: 1 × Atmospheric Pressure Sensor Note: Color appearance may vary slightly due to lighting conditions and display settings. Measurement tolerance: ±1–3 cm.