Dwyer DW-USB-4 is a compact USB data logger designed for temperature, relative humidity (RH), voltage, current, thermocouple, and carbon monoxide measurements. It features a user-replaceable 3.6 V 1/2 AA lithium metal battery, an ABS plastic blend housing, and a generous memory capacity of 16,382 readings for temperature and RH, and 32,764 readings for voltage, current, thermocouple, and carbon monoxide. With selectable sampling rates and a USB interface, this logger is compatible with Windows® 7, Windows® 8, and Windows® 10. It also offers programmable high/low alarms and a stop on memory full sampling mode.