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1·A mercury manometer could cause a pollution hazard.

水银压力表可能产生污染破坏。

2·Consists of gas tube, manometer, volume controller, clamp and scale. No danger of pollution without mercury.

由气柱玻管、压力表、定容机构、固定架和体积标尺组成。本仪器不使用水银，消除了污染。

3·An instrument used to measure pressure. A manometer consists of a U-shaped tube partially filled with a liquid that can vary in specific gravity from 1.0 (water) to 13.57 (mercury).

测量压力所用的一种仪器，压力计由部分装有相对密度在1.0(水)至13.57(汞)范围内的液体的U形管组成。