Testo 184 H1 Kit of 10 Temperature & Humidity Loggers. Simple to use with a tamperproof design. -20~70DegC & 0~100%RH. HACCP Certified. Has built in USB port and will download to Android devices using NFC. Battery life 120Days (15min sampling). Includes software for download of data to A PC. Saves data by default to a PDF file.