How to Test the Voltage of Zener Diode without variable DC power supply

In this video, I have explained the followings about Zener diode:
1. What is Zener Diode
2. Application of Zener diodes
3. How to test Zener voltage of a Zener diode with zener tester using 3nos 9v batteries and a multimeter
4. How to check zener diode with variable DC power supply
5. How to identify Zener diode wattage

The whole testing process is shown in steps so that you will face no difficulty while testing the voltage of zener diode.

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