Why is the brightness of the neon tube of the test pen on the market generally not high?
You all know that it is a neon tube. For the cost issue, you can buy some high-end ones with LCD, and the display will be much better.

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Apr 09, 2022
Why is the brightness of the neon tube of the test pen on the market generally not high?
You all know that it is a neon tube. For the cost issue, you can buy some high-end ones with LCD, and the display will be much better.

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