This is an instrument which draws a gas or vapour through an appropriate glass testing tube, each tube being treated with a chemical that will react with a particular gas, causing discolouration progressively down the length of the tube. When measured against a scale, the parts per million (ppm) can be ascertained.
The instrument is used extensively on the chemical carrier trades though it does have tubes for use with hydrocarbons, which make it suitable for use on tankers.
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