GasCVD natural gas calorimeters are designed to promote fair trade. They measure the calorific value (roughly, the heating power) of natural gas. GasCVD is 1/5 to 1 /20 the price of a general gas chromatograph. Its response time is less than 30 seconds, which is 10 times faster than a general gas chromatograph. The series is OIML- and WELMEC-certified for accuracy and ATEX- and IECEx-certified as flameproof and explosion-proof.