Hand-cranked drill tester
The hand-cranked drill tester is designed specifically for micro experiments in middle school chemistry. It uses an aluminum alloy body and a 3mm stainless steel drill bit, driven by a hand crank handle, with zero power and zero noise. It can accurately drill holes on rubber stoppers, cork stoppers or plastic sheets, with adjustable hole sizes of 1-6 mm, and comes with a depth limiter to prevent excessive penetration. The base anti slip fixture is used to fix the test tube plug, which can be operated by students with one hand. It is safe and efficient, and is an essential tool for assembling burettes and gas generators.
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