Charger for digital gauges, UK, 230 V, 3-pin square

For use with Mecmesin digital force and torque gauges. 230 Volt with 3 square pins. Commonly used in the UK.

The mains adaptor/charger is a constant-current type:
Primary circuit: 230V – 50Hz
Secondary circuit: 100mA constant current at 9V Charger output plug: Centre = positive Outer = negative