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Select your own temperature range and scale; humidity or dew point scale; and 24-hour, 7-day, or 31-day rotation period (charts available separately) prevent setting changes with Lock-Out dip switch. Rear panel features keyhole slots for wall mounting. These rugged and compact recorders use microprocessor-based replaceable electronic sensors to record temperature and humidity measurements. Units feature a digital display with high/low alarms and a SPST 24 V, 500 MA relay capable of shutting down a process in alarm status. What's included: one red pen, one Blue pen, 120 VAC adapter, probe with 10 ft cable (model 80001-53), and one 9 V battery (backup power). selectable units and scales-choose Chart paper based on your needs no inadvertent changes with Lock-Out dip switch sensor probe is mounted on a 10-ft cable.