名词
中文翻译：测试者
同义词：
['tester', 'test instrument']
例句：
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1. The formationtester was used to measure the density of the soil.
使用测试器来测量土壤的密度。
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2. The engineer used a formationtester to inspect the pipeline for any leaks.
工程师使用测试器检查管道是否有泄漏。
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3. The formationtester was crucial in determining the optimal drilling parameters.
测试器在确定最佳钻探参数中至关重要。