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 than previous-generation sensors. Precise altitude detection supports indoor positioning where GPS signals are unavailable. By adding vertical positioning data to existing horizontal information, emergency responders can better estimate the floor level of a smartphone user during an emergency call. Typical relative accuracy: ±0.03 hPa; typical absolute accuracy: ±0.5 hPa. This performance exceeds that of comparable market sensors, enabled by enhanced temperature stability, reduced drift, and lower noise. Operating temperature range: 0°C to +65°C. Typical temperature coefficient offset (TCO): ±0.6 Pa/K. RMS noise: 0.9 Pa — 25% lower than the prior-generation BMP380. The sensor features high long-term stability and low short-term and long-term drift. Material: Plastic Color: Purple Package Includes: 1 x Atmospheric Pressure Sensor Note: Color appearance may vary slightly due to lighting conditions and display settings. Measurement tolerance: ±1–3 cm.