RC-51H is temperature and humidity data logger. It is very easily use, which can generate PDF report automatically, without any software. It is USB designed and waterproof. The USB model, can plug easily into a laptop and generate the data report automatically, without installing data management software. The data can still be read even if the battery runs out. Features: 1. Generate PDF report automatically. 2. Multiple alarm indication. 3. High waterproof protection grade, wide range of applications. 4. High accuracy sensor with long-term stability property. 5. USB port, plug and play easily. 6. 32000 recording point. After run out, it can be restored by software setting. 7. 2 years’ battery life. Suitable for medical use, catering, food, science, flowers, breeding industry, laboratory and greenhouse, etc.