truAPM | Advanced Panel Meters by truAPM
truAPM | Advanced Panel Meters by truAPM


The APM-MAX is our largest APM yet at 108mm x 108mm [4.25″ x 4.25″]. A programmable digital panel meter specifically designed for the effective display and monitoring of power, it is configurable to measure voltage, current, watts or frequency.

Trumeter APM MAX Meter

Trumeter APM MAX Meter

The APM-MAX combines the instant visual representation of an analog meter with the speed and accuracy of a digital meter for instant recognition and precision measurement. A large digital panel meter with a 81.5mm x 66mm display that features a two-line display, programmable scale, alarm set-points and color-changing, full color RGB backlight for instant alerts.



The APM-MAX is available on two main models with a range of features available:

for high voltage applications; configurable as an amp meter, volt meter, frequency meter or for power monitoring (Watts, VA & Power Factor).

for low voltage applications; configurable as a process meter or a shunt meter.

Both models feature digital and analog outputs, and optional serial MODBUS® RTU and/or ethernet MODBUS® to communicate with other components in a system, IP65 ratings and our industry leading three-year warranty.



The APM-MAX Meter’s unique display features dynamic backlight that can be tailored to alert the user when a critical parameter is out of range as well as flash and/or change color (or intensity). With a full-color RGB display you can programme the backlight to be almost any colour and act as an immediate visual indication of critical parameters, improving performance monitoring as well as safety.

MAX Meter APM Backlight Color Change

The APM-MAX is easily customized to your requirements via the configuration software. The 60-segment bar graph can be programmed to the scale you require, as well as alert, setpoints and messages on the starburst display. The rate meter has analog and digital outputs and optional MODBUS® connectivity to interface with other systems and is available with either a positive or negative LCD, making it visible in almost any conditions.

Trumeter APM MAX Meter Positive and Negative LCD

Trumeter APM MAX Meter Positive and Negative LCD



Part Numbers

Standard Models – Modbus RTU

APM-MAX-M21-PU-4R Positive LCD, volt, amp, freq or power monitor, RTU
APM-MAX-M23-PU-4R Positive LCD, process or shunt meter, RTU
APM-MAX-M21-NU-4R Negative LCD, volt, amp, freq or power monitor, RTU
APM-MAX-M23-NU-4R Negative LCD, process or shunt meter, RTU



Standard Models – Modbus TCP/IP and RTU

APM-MAX-M21-PU-4B Positive LCD, volt, amp, freq or power monitor, TCP/IP and RTU
APM-MAX-M23-PU-4B Positive LCD, process or shunt meter, TCP/IP and RTU
APM-MAX-M21-NU-4B Negative LCD, volt, amp, freq or power monitor, TCP/IP and RTU
APM-MAX-M23-NU-4B Negative LCD, process or shunt meter, TCP/IP and RTU

LCD, PSU Type, Insulation Type, Serial Output and Communications options availble – see datasheet for full part numbers

Units with Low Voltage power supplies are not UL compliant



Not EXACTLY what you were looking for?
You Visualize. We Customize.

Read More

Get in Touch

Complete the form below and we’ll get in touch within 1 business day.

Your Location

APM-MAX Features

The next generation of Panel Meters.

Easy to Use.

Easy to Read.

Key Features of the Trumeter APM-MAX Meter

Large Multi-format Display that Incorporates:

  • 60 segment bar graph display
  • Large 108mm x 108mm display
  • Starburst display area for annunciators, custom messages and alarm information
  • Dynamic backlight color
  • 0.1% Accuracy


  • User adjustable backlight brightness and color
  • Our largest display yet
  • Wide viewing angle (both horizontal and vertical)
  • Custom annunciators


  • Scale and Range (min and max)
  • Custom annunciators
  • User selectable backlight color and intensity
  • Two independent alarm set-points
  • Modbus communication or two independent outputs
  • 4-20mA analogue monitor output

Panel cutout: Square: 68mm x 68mm [2.7” x 2.7”] Circle Diameter: 96mm [3.8”]

Easy to set-up software

Just plug into any free USB port on your PC.
Run the freely available APM Configurator and you’re off.