• True-rms current measurement.
• Frequency measurement (Hz).
• Dual display for AC Ampere (Analog)/Frequency (Digital).
• Display Hold.
• Power-Up Self Test.
• Beeper provides audible feedback.
• Clip-on Holster.
• Auto and Manual Ranging.
• AC/DC Voltage, Resistance, Continuity, Power Lock and
  Auto-Power off.
Models 133
• Crest – instantaneous peak current readings
• Max/Min – Records maximum, minimum and average
  frequency of RMS current.
• Soft – 3 second running average of RMS current, frequency
  or voltage.