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Product: NEWTRY ZX21 Decade Resistance Box Adjustable Lab Rotary Resistor Substitution Box Precision DC Variable Knob Switch 0 to 99.9999KR 0.25W ZX21 series rotary resistance box for the DC circuit for use adjustable resistance, has a lower value of zero resistance, are all the most commonly used laboratory instruments for schools, factories and research units for electrical measurements and other experiments.
When you test with the item, please make sure the voltage is under 5V, and the current is under 50 mA.
The power is 0.25W

Major performances
Made of high quality manganese copper wire, the resistance value does not change with the temperature, so that the resistance box is more accurate.
With high quality metal film resistors, it is more expensive than carbon film resistor, but it has good stability, little influence on temperature and high accuracy.
Better use knob switch designed according to customer needs
Note:
1.When the proper use of resistance box to rotate the knob in each group, so that the contact resistance is stable and reliable.
2. The maximum allowable current value of the resistance box in use should never exceed the specified.
3. When only a small change in resistance, then wire to the "0" and another small indication terminal, can reduce the resistance inside the lead resistance.
4.The resistance box should be placed in shelter room, the air temperature +10℃~ + 40℃ , relative humidity below 80%, should not contain harmful impurities which can cause corrosion.
Attention:
we will send the product to you as soon as possible
If you have any questions , please feel free to contact us
★[WIDE RANGE OF APPLICATIONS]:This product is suitable for electrical measurement and other experiments in schools and scientific research institutions.
★[HIGH QUALITY MATERIALS]:With high quality manganese copper wire winding, the resistance value basically does not change with temperature. Compared with carbon film, it is a selection of high-quality metal film resistors, which has good stability and high accuracy.
★[FINE MANUFACTURING TECHNOLOGY]:Firstly, this product uses better knob switches designed according to customer's needs. Secondly, the base insulation resistance is high. Thirdly, the contact resistance is stable and reliable when the resistance box is properly used to rotate each group of knobs.
★[HIGH PERFORMANCE]: After rigorous processing and long-term aging, the product has the characteristics of high accuracy and good stability.
★[PORTATBLE AND CONVENIENT]:Resistors are small in size and easy to carry. The switch is fully sealed and does not need cleaning. NEWTRY