<p>The math operations will only happen to numbers (via the SNMP return type). The inclusion of a ; means it is returning as a string.</p>

<p>You might try using the <a href="http://www.oidview.com/mibs/0/UPS-MIB.html">UPS-MIB OIDs</a> and see if the frequency endpoint there returns a cleaner value first.</p>

<p>That's just bad/lazy MIB design that defeats the purpose of SNMP. </p>

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