1. The resistor board uses 0.1% for resistor 2. The resistor is plug-in, not patch. The distance between the two pins of the patch is small, moisture makes the resistance value smaller, and the stability is poor 3. Instead of using a pull-, -plated pin is used. The contact resistance of the pull- is too large, which affects the accuracy of small resistance values. The contact resistance of the gold-plated pin is more than half smaller than that of the pull- In addition, a high-resistance resistor board is added, which is used to calibrate the multimeter or insulation withstand voltage tester, and the high resistance meter uses RI80 high-voltage resistor with 1% accuracy. This resistor is specially used for high-voltage insulation detection standard for resistor. If you use ordinary resistors, it 't work. Ordinary resistors are easily affected by moisture, have high voltage coefficients, and the resistance value changes too much after adding voltage. They cannot withstand high voltage. This high-resistance resistor board can withstand 5000V. Specification: B: 0.1Ω-9.999999 Color: As Shown Material: Plastic+Metal Package Contents: 1 * Board 1 * case 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.