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 enables indoor positioning where GPS signals are unavailable. By adding vertical positioning data to existing horizontal information, emergency responders can better determine the floor level of a smartphone user during an emergency call. Typical relative accuracy: ±0.03 hPa; typical absolute accuracy: ±0.5 hPa — among the highest in the market. This performance results from enhanced temperature stability, reduced drift, and lower noise. Operating temperature range: 0 °C to +65 °C. Average temperature coefficient offset (TCO): ±0.6 Pa/K. Noise level: 0.9 Pa — 25% lower than the BMP380. The sensor also features high long-term stability and low short-term and long-term drift. Material: Plastic Package Contents: 1 × Atmospheric Pressure Sensor Note: Color may vary slightly due to lighting conditions and display settings. Measurement tolerance: ±1–3 cm.