What are the precautions for the safe use of ඉහළ උෂ්ණත්ව විදුලි උදුන් before the experiment?

1. Check whether the stove is clean, clean up debris, and ensure that the stove is clean.

2. Check whether the furnace wall and the furnace bottom are damaged.

3. Check the installation and tightening of the resistance wire and thermocouple guide rod, and check whether the meter is normal.

4. Check whether the resistance furnace door switch is flexible.

5. After ensuring that the object is normal, start placing the workpiece.