code: def check_ups_input_frequency(the_session, the_helper, the_snmp_value):
      
      a_frequency = calc_frequency_from_snmpvalue(the_snmp_value)
      the_helper.add_metric(
          label=the_helper.options.type,
          value=a_frequency,
          uom='Hz')
  
      the_helper.set_summary("Input Frequency is {} Hz".format(a_frequency))
docs: OID .1.3.6.1.2.1.33.1.3.3.1.2.1
      MIB excerpt
      The present input frequency.