Uploaded April 2025 | Updated September 2026, 4 days ago

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Ever wondered what's inside your digital clamp meter? I cracked open the TESMEN TCM-300D to show you how modern multimeters work — and why they no longer use those old-school glass fuses! Instead, you'll find a PTC (positive temperature coefficient), a clever self-resetting fuse that helps protect your tools and circuits.

Perfect for electricians, DIYers, tech lovers, and tool nerds. Let me know if you’ve seen this in your own meters!

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