The Sonoff SNZB-02B, also known as the AirGuard TH Lite, is a compact Zigbee 3.0 temperature and humidity sensor designed for precise environmental monitoring. It provides high accuracy with a temperature margin of ±0.2°C and humidity within ±2% RH, updating data every 5 seconds to ensure you have a real-time view of your surroundings. Beyond basic readings, the device calculates the dew point and vapor pressure deficit, while a compatible app allows you to track data history for up to 6 months. Measuring 66.3 mm by 27.8 mm, this shieldless sensor features a minimalist design and includes an orange carrying strap for easy placement. It runs on two AAA batteries, which can last up to 2 years, making it a reliable choice for specialized spaces where power outlets are unavailable. Because of its small size and precision, it is well-suited for monitoring sensitive environments such as cigar humidors, instrument cases, wine racks, reptile terrariums, or greenhouses.