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 identify 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 stems from enhanced temperature stability, reduced drift, and lower noise. Operates across full temperature range (0 °C to +65 °C). Average temperature coefficient offset (TCO): ±0.6 Pa/K. RMS noise: 0.9 Pa — 25% lower than the BMP380. Features excellent long-term stability and low short-term/long-term drift. Material: Plastic Package Includes: 1 × Atmospheric Pressure Sensor Module Note: Color may vary slightly due to screen settings and lighting conditions. Measurement tolerance: ±1–3 cm.