The reference board replacement is constructed with exquisite electronic components, with high for precision, good stability and strong practicality. This resistance and capacitance board is very easy to operate, you only need to for align the positive and negative poles with the corresponding capacitors to obtain accurate readings for calibrating the Ad584 multimeter. This reference board is made of excellent PCB material, which is for durable, not easy to damage and resistant to high temperature. This resistance standard board has a wide range of applications and can be used to calibrate measuring instruments, electronic production, teaching experiments, automatic test systems, etc. Product Name: Reference Board Color: Green Material: PCB The words filled in are random and cannot be specified. Package Contents: 1 x Capacitor Reference Board 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.