EXTECH RH520AB HUMIDITY+TEMPERATURE CHART RECORDER W/DETACHABLE PROBE GREEN UNIVERSAL AC HUMIDITY AND TEMPERATURE CHART RECORDER WITH DETACHABLE PROBE USES GRAPHICAL DATALOGGER FOR HUMIDITY/TEMPERATURE MEASUREMENTS AND DEW POINT CALCULATION. SIMULTANEOUS NUMERICAL AND GRAPHICAL DISPLAY OF HUMIDITY AND TEMPERATURE READINGS PLUS TIME AND DATE. COMPLETE WITH BUILT-IN STAND DETACHABLE PROBE WITH 3 FT (1 M) CABLE RS232 CABLE RS-232 TO USB ADAPTER LAB VIEW-BASED PC SOFTWARE 100-240VAC 50/60 HZ ADAPTER AND 3 AA BATTERIES.