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Pencil Lead Core Micro-strength Tester
This instrument is used for the following tests：
Pencil lead tip stress test: A sharpened pencil is installed on a 45-degree holder. The force on the lead tip when it is damaged;
Pencil lead bending strength test: Place the lead on a "V" shaped bracket, place a knife edge above the bracket, and test the force value when the lead breaks.
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