Barometer: A 3-in-1 function consisting of an outdoor thermometer, hygrometer, and analog barometer. The weather station provides an accurate analog display of atmospheric pressure, humidity, and temperature, along with a practical and clear weather trend indicator. Wall-mounted: Lightweight design with a hanging hole on the back for easy wall installation. Suitable for use in homes, offices, or other indoor spaces. The dial features a clear weather display ideal for general weather assessment. High Quality: Constructed with a high-quality aluminum alloy frame and PMMA plastic. Durable materials ensure long-term reliability. No batteries or special maintenance required. Measurement range: Temperature from -30C to 50C, humidity from 1% to 99% RH, atmospheric pressure from 970 to 1050 hPa. Wide range of applications: Analog weather station suitable for both indoor and outdoor environments. Ideal for placement in bedrooms, living rooms, offices, greenhouses, and storage areas. Product parameters: Product: Thermometer, hygrometer, barometer three-in-one weather station Model number: THB9392 Measurement range: 9601060 hPa, -3050C, 099% RH Resolution: 1 hPa, 1C, 2% RH Measurement accuracy: 5 hPa, 2C, 5% RH (within 4070% RH) Product size: Approximately 13 x 4.1 cm Testing tips: 1. Observe temperature change: Place the device in an environment with a significant temperature difference from room temperature. Allow time for the mechanical movement to respond, as changes occur gradually. 2. Observe humidity change: Breathe onto the opening located at the bottom of the units back. The humidity pointer will rise and then return to normal after a short period. 3. Observe air pressure change: Atmospheric pressure varies by location. The pointer may shift outside the normal range in areas with very low pressure. Changes are typically noticeable during transitions between weather conditions, such as from sunny to rainy. If no movement is observed, align the comparison pointer with the current air pressure reading and monitor changes over several days. 4. The black pointer indicates current atmospheric pressure. The silver pointer is a comparison marker. Adjust the silver pointer to match the black pointer, then observe relative changes over time to determine if pressure is rising or falling.