Built in Dual DC Power Supply IC Regulated +5V DC, 150mA & 3.5Digit Meter 200mV (Weights in mV) Strain Sensor: Measurement Cantilever Beam (Wheatstone Principle) fixed with the beam the circuit to observe waveforms and voltages Carrying out through 9 Pin D Connector Resistors, Capacitors, IC AD620, Variable Resistor for Gain and Zero Setting, Bridge Circuit on Board.