With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
entSensorValueEntry
Cisco Entity Sensor Value Entry
1.3.6.1.4.1.9.9.91.1.1.1.1
An entSensorValueTable entry describes the present reading of a sensor, the measurement units and scale, and sensor operational status.
Back to CISCO-ENTITY-SENSOR-MIB MIB page.
IPHost Network monitor allows you to monitor entSensorValueEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.