With IPHost Network Monitor you can run simple snmp requests against a Liebert device in your network.
lcUpsInputFrequency
Liebert Ups Input Frequency
1.3.6.1.4.1.476.1.1.1.1.3.1
The current input frequency. (Unit of measure: Hertz)
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IPHost Network monitor allows you to monitor lcUpsInputFrequency on Liebert device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Liebert uninterruptible power supplies right now.