Model M3I

Basic Force / Torque Indicator

The M3I digital force / torque indicator is designed to work with a wide range of Mark-10 remote force and torque sensors. With exclusive Plug & Test® technology, all calibration and configuration data is saved within the sensor’s smart connector, not the indicator, allowing for true interchangeability. In addition, all sensors are fully compatible with other Mark-10 indicators.

The M3I shares its menu structure and most specifications with Series 3 digital force gauges. The sampling rate is 2,000 Hz, producing accurate results under a wide range of test conditions. A backlit graphic LCD displays large characters, and a menu is available to access the gauges’ features and configurable parameters. The display also features an analog load bar for graphical representation of applied load, as well as set point indicators for pass-fail testing. USB output is provided for data collection purposes.

The M3I includes MESUR®Lite data acquisition software, for tabulation of continuous or individual data points. One-click export to Excel allows for further data manipulation.


  • Interchangeable force and torque sensors through Plug & Test® technology (sensors are sold separately)
  • High-speed 2,000 Hz sampling rate
  • Ultra-compact size
  • Large backlit graphic display
  • Programmable set points with pass/fail indicators
  • Live load bar graph with set point markers
  • Peak readings and set points always displayed
  • Configurable audio alarms and key tones
  • Programmable auto-shutoff
  • Configurable audio alarms and key tones
  • Battery or AC operation
  • MESUR® Lite data collection software included
  • CE mark


Accuracy:  ±0.2% of full scale + sensor
Sampling rate:  2,000 Hz
Power: AC or rechargeable battery. Multi-step low battery indicator is displayed, gauge shuts off automatically when power is too low.
Battery life: Backlight on: up to 7 hours of continuous use
Backlight off: up to 24 hours of continuous use
USB Output: Configurable to 115,200 baud
Configurable settings: Digital filters, outputs, automatic output (via USB/RS-232), automatic shutoff, default settings, averaging mode, external trigger, passwords, key tones, audio alarms, backlight, calibration
Safe overload: 150% of full scale (display shows “OVER” at 110% and above)
Weight: 0.7 lb (0.3 kg)
Shipping weight: 3 lb (1.4 kg)
Environmental requirements: 40 – 100°F, max. 96% humidity, non-condensing
Warranty: 3 years (see individual statement for further details)
HS code: Model no. HS code:
M3I (all models) 9024100000
Country of origin: USA

Plug & Test® Sensors

Select from a broad range of interchangeable force and torque sensors, with force ranges up to 10,000 lbF (50 kN) and torque ranges up to 5,000 lbFin (550 Nm)

Plug and Test® Force Sensors


S-beam force sensors, tension and compression


Miniature button force sensors, compression only


Inline force sensors, tension and compression


Miniature S-beam force sensors, tension and compression


Fully enclosed smart sensors, push and pull


Wire crimp pull sensor, tension only


S-beam force sensors for Series F Advanced Test Frames


Integrated force sensor for Series F Advanced Test Frames

Plug and Test® Torque Sensors


Universal torque sensors


Universal torque sensors with interchangeable attachments


Tool calibration torque sensors


Closure torque sensors


High capacity torque sensors

In The Box

The M3I Force / Torque Indicator is shipped as shown at left, and includes the following accessories:
(1) Carrying case
(1) USB cable
(1) AC adapter
(1) Battery
(1) Certificate of calibration without data

Force and torque sensors are available separately.

Optional Equipment

Table top stand (AC1100)
Conveniently positions the indicator for easy viewing.
Includes thumb screws for indicator installation and thru holes for bench mounting.

MESUR®gauge Plus software (15-1005)

Tabulates and plots load vs. time or load vs. travel. Also calculates statistics, exports to Excel, and more.
Combined certificate of calibration, indicator with sensor (CERT-SI)
Mark-10 will calibrate and supply a certificate of calibration for the indicator and one sensor, instead of separate certificates.
No-charge option at time of purchase.



Ordering Information

Model Description US Price
M3I Force/torque indicator, 110V $675.00
M3IE Force/torque indicator, 220V European Plug $675.00
M3IU Force/torque indicator, 220V UK Plug $675.00
M3IA Force/torque indicator, 220V Australia Plug $675.00
Additional Items to Consider
15-1005 MESUR®gauge Plus software $710.00
AC1111 Spare USB cable $30.00
AC1118 Spare rechargeable battery $20.00
AC1030 Spare AC adapter, 110V $45.00
AC1031 Spare AC adapter, 220V EUR $45.00
AC1032 Spare AC adapter, 220V UK $45.00
AC1035 Spare AC adapter, 220V AUS $45.00
AC1100 Stand, tabletop, indicator/torque gauge $175.00
CERT-SI Combined certificate of calibration with data, indicator + sensor, calibrated as a set $0.00