The RHT20 is a humidity and temperature datalogger designed to monitor environmental conditions across diverse applications including warehouses, storage rooms, freezers, and shipping vans. It features a temperature measurement range of -40 to 158°F (-40 to 70°C) with 0.1°F/°C resolution and humidity measurement from 0 to 100%RH with 0.1%RH resolution, delivering accuracy of ±1.8°F in the 14 to 104°F range and ±3%RH in the 40 to 60% range. The device records up to 16,000 readings for each parameter with user-programmable datalogging intervals ranging from 1 second to 24 hours, and includes user-programmable alarm thresholds for both temperature and humidity. Data is easily accessed via USB interface for download and analysis using Windows-compatible software, while the LCD display provides real-time visibility of current readings, minimum/maximum values, and alarm status. The compact design (3.7 x 1.9 x 1.2 inches) powered by a 3.6V lithium battery makes it ideal for continuous environmental monitoring in critical storage and logistics applications.