1: The 4-wire for shorting provides a convenient way to short 2-wire and 4-wire digital multimeter (for ) inputs together. 2: It consists of four gold-plated banana. This allows easy checking of for offset for instrument verification or offset elimination during basic testing. Due to the gold-plated pins and PCB structure, the resistance between the for HI and LO pins is very low (Less than 1 m). However, the absolute resistance and thermal voltage offset for 2-wire or 4-wire configurations are not specified, and metrological traceability applications are not recommended. 3: The 4 banana heads have a pin pitch of 19.05mm, which is suitable for most benchtop multimeters. The banana is pure copper with gold plating and a beautiful shell. We also keep the position of the resistor. You can also put the RX-700.25W/0.5W standard resistor in it. This way, it is a standard resistance source, which is directly into the multimeter, which is more convenient. 4:User Guide:The 4-wire for short circuit should be inserted into the input banana of the for by carefully aligning the for for HI and LO inputs with the pairs marked on them (usually for HI up and LO down). Although all four pins are shorted to each other, the heaviest trace runs between the for HI and LO pairs, and the center point trace is smaller. Color: As Shown Material: PCB Package Contents: 1 x Resistance Calibration Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.