Unverified82% confidenceDecision RuleTime unknown
选购时看刻度是否印在玻璃管上并有放大棱镜设计（三棱柱管身），棱镜能放大水银柱便于读数，老年人视力较弱者应优先选带放大棱镜的款式
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82%
Confidence
Long-term
Relevance
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