The Sonoff SNZB-02LD is a Zigbee-powered smart thermometer designed for precise environmental monitoring in challenging locations. It features a dedicated external probe made of 304 food-grade stainless steel, allowing you to measure temperatures from -40°C to 115°C in areas where the main unit cannot reach, such as inside freezers, tanks, or pipes. The main device itself tracks ambient temperature between -10°C and 60°C and humidity from 0% to 100% RH, displaying these readings on a clear 2.2-inch LCD screen. Built from a durable PC+ABS housing with an IP65 rating, the unit is dust-tight and protected against water jets, making it suitable for humid greenhouses or industrial zones. The 1.5-meter probe cable provides flexibility in placement, while the system ensures high precision with a temperature accuracy of ±0.2°C and humidity accuracy of ±2% RH. Data refreshes every 5 seconds to keep you updated in real time via the eWeLink app, provided you have a compatible Zigbee 3.0 hub. Weighing 86.2 g and measuring 62.8 x 58.5 x 21.8 mm, the device is compact and powered by a single CR2477 battery. This setup is particularly useful for those needing to monitor sensitive storage or industrial equipment without exposing the electronics to extreme cold or moisture.