Hydrogen sulfide (H2S) monitors usually employ electrochemical sensors, as do the sulfur dioxide, chlorine, and fluorine monitors. It is designed for survey work or continuous monitoring. These are ideal for leak testing, ventilation and board emission checking, for backing up a continuous monitoring system or just about anywhere toxic gas is a concern. Each analyzer has an integral sample-draw pump and analog direct-read display. The detection element is an electrochemical voltammetric sensor that delivers highly reliable performance.