M3 - 2 Inductive probes display




    The M3 is the last generation tool for dimensional control from 1 or 2 Inductive probes.

    Several versions are available allowing you to connect inductive probes from any brand:

    - Metro

    - Tesa

    - Mahr



    Thanks to its user friendly interface and its general simplicity the M3 is a device that will be immediately adopted by every operator.


    The 4''3 resistive touch screen display can be used with gloves.


    This digital readout has several way of communication, USB and RS232 to remote control the device and/or send the measurements to an external system.




    Its housing machined in a solid aluminium block offers the M3 an incomparable robustness even when used in the most severe industrial environments.



  • 2 measurement configurations (2 characteristics)
  • Different display modes with 1 or 2 measurements, with or without tolerances.
  • Tolerance limits and control limits (Warnings).
  • Absolute or relative measurement
  • Direct or dynamic measurement (Min, Max, Max-Min , Average, Median)
  • USB communication "virtual keyboard"
  • Modbus-RTU or ASCII Communication on RS232
  • Sorting by classes of size, up to 16 classes by characteristic
  • Possibility to connect an optionnal I/O module with 8 optocoupled I/O.
  • Possibility to connect a multi-function footswitch (measurement transfert, calibration etc...)
  • Optionnal external module for temperature compensation from PT100 sensor or Type K thermocouple.
  • Easy to use and reliable





Many functions and measurement mode can be selected through the keyboard:


  • Tolerance limits, Control limits (warnings) Dimension of the master piece (reference piece) .
  • Calculation formula (C1, C2, -C1, -C2, C1+C2, C1-C2, -C1+C2, -C1-C2, 3 points diameter)
  • Calibration
  • Different display modes with 1 or 2 characteristics displayed
  • Direct or dynamic measurement (Max, Min, Max-Min, Average, Median)
  • Absolute or relative measurement
  • Sorting by classes of size, up to 16 classes by characteristic
  • Measurement direction inversion
  • Possibility to lock selected functions with a password
  • Display resolution (from 2 to 5 decimals)
  • M-Bus connector for the optionnal connection of a module with 8 input/outputs (go, nogo, preset, send measurement etc...)
  • Metric (µm or mm) or imperial measurements (inches)
  • Selection between 2 measurement configurations (2 characteristics)
  • Automatic change of program by moving the probes
  • Different languages installed. New language can be installed upon request


USB Connection


The M3 is fitted with a mini-USB connector with 2 functions :

1. Power supply through a wall mounted transformer. This transformer supplies a regulated 5V/1A DC voltage.
2. Measurement transmission. If you connect your M3 to a PC, the PC will detect and install automatically the M3 as a standard USB keyboard with the standard drivers of your operating system (Windows, Mac OS etc..). When you will send the measurement, the value will be writting on your PC screen where your cursor is, in the same way as it would have been typed with a keyboard.
No need to install any specific driver or software.





The RS232 interface allows to monitor and configure all the M3's functions through ASCII commands or MODBUS-RTU



The M3 is very easy to configure and to use thank to its user friendly interface :

Display with needle indicator

1 characteristic display with control limits (Warnings)

2 characteristics display

Icon desktop (Configuration menu)

Configuration window

Display mode without tolerances and direct access to preset modification







As an option, it is possible to connect a M-Bus I/O module fitted with 8 optocoupled inputs/outputs.

Available functions :
- Part 1 or 2 : Go/NoGo
- Calibration/Preset
- Start dynamic measurement
- Measurement transfert
- Zero
- Switch from part 1 to part 2
- Stop




It is possible to connect the M3 to a PLC, allowing an automated control range and sort of the parts. This communication uses MODBUS-RTU protocol.







Retrofit of a gauging fixture that was mounted with needle indicators on a 100% sorting working place:
Out-of-round (Max-Min) measurement on 2 points of a cylindrical part. Start measurement with a footswitch.
Customer benefit : Accuracy increased (1/10th of Micron), instantaneous reading of the 2 characteristics without the risk of wrong reading of the needles. Measurement transmission to a central SPC/ERP software. Significant time saved on this control place.


Mesurement of diameter in 3 points




Communication between a M3 display and a Proface PLC with the Modbus RTU protocol. The HMI from Proface has been programmed with differents buttons and indicators allowing to control and bring back informations from the M3. This Proface example can be downloaded from here








Item references


Item Reference
Display M3 with 2 inputs for inductive probes (Metro) 13010
Display M3 with 2 inputs for inductive probes (Tesa) 1301T
Display M3 with 2 inputs for inductive probes (Mahr) 1301M
Cable with Digimatic output for Mux and Mitutoyo DP1 printer 18193
RS232 communication cable to P.C. 45160
Multifunctional footswitch 18020



MB-IO module : (ref MB-IO)


This M-Bus module is fitted with 8 input/outputs isolated with optocouplers allowing to get additionnal functionnalities, for example : output for Go/noGo, input for preset or start dynamic measurement... The M-Bus modules are mounted on an aluminium profile allowing to mount them on a standard DIN rail. More information on this page : M-BUS

Multifunctionnal footswitch : (ref 18020 )


This footswitch with a robust construction can be configured in different ways : preset, measurement transmission, start dynamic measurement etc...

M-Bus cable for M3 : (ref 81213-1.5 )


This cable allows to connect the compatible M-Bus modules (MB-IO, MB-RL and MB-TP) on a M3 display unit (MB-IO, MB-RL and MB-TP)

Magnescale probe adapter for M2/M3 TTL : (ref 24062 )


This cable allows to connect 1 Magnescale probe on a M2 (ref 15000)/M3 (ref 13000) display. It integrate an electronic board that manages the error signal form the Magnescale probes.

Heidenhain M23/11µA to D-SUB 15 adapter for M2/M3 11µA/1Vpp : (ref 84100 )


This cable allows to connect 1 Heidenhain probe like MT12 or MT25 with the round M23 connector on a M2 (ref 15020)/M3 (ref 13020) display.

Mitutoyo LG adapter for M2/M3 TTL : (ref 24061 )


This cable allows to connect 1 Mitutoyo probe on a M2 (ref 15000)/M3 (ref 13000) display.

RS232 communication cable: (ref 45160 )


This cable allows to connect a M2 /M3 display to a computer.

RS232 to Digimatic communication cable: (ref 18193 )


This cable allows to connect a M2 /M3 display to a Multiplexer Mux from Metro.

RS232 to USB communication cable: (ref 45173 )


This cable allows a M2 /M3 display to communicate with a computer. It creates a virtual COM port on the computer. It is delivered with a driver on a CD.


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