With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoEnvMonVoltageStatusIndex
cisco Environmental Monitor Voltage Status Index
1.3.6.1.4.1.9.9.13.1.2.1.1
Unique index for the testpoint being instrumented. This index is for SNMP purposes only, and has no intrinsic meaning.
Back to CISCO-ENVMON-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoEnvMonVoltageStatusIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.