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The Trumeter APM-MAX-M21-PU-4B is an all in one advanced panel meter for measuring amps, voltage, frequency, or power. The APM MAX M21 is well suited for high voltage applications and features a full-color RGB backlight for endless configuration options. The meter includes Modbus RTU and/or Modbus TCP/IP for seamless integration and has a 25% larger screen than a standard APM.