Tested and working 

Mark-10 M3i digital force/torque indicator with Mark-10 MR50-20Z Plug & Test torque sensor. Sold together as a complete torque measurement system.

Indicator: Mark-10 Model M3i, Series 3. S/N 3524605. Accuracy ±0.2% of full scale ±1 count. 2,000 Hz sampling. USB output. Made in USA. Works with any Mark-10 Plug & Test force or torque sensor.

Sensor: Mark-10 MR50-20Z, Series R50, Plug & Test. S/N 3573661. Capacity 20 ozF·in (14 Ncm), bi-directional. Jacobs chuck accepts bits/samples up to 1/2" (12.7 mm). Made in USA.

Calibration data is stored in the sensor's Plug & Test smart connector.

Included: M3i indicator, MR50-20Z sensor with cable, AC adapter, hard case, Resource CD, and original certificates (Certificate of Conformance for the indicator dated June 6, 2013; Certificate of Calibration for the sensor). No battery or USB cable included.

The certificates are the originals and are not a current calibration.

Condition: Used (excellent). Tested — powers on and reads.