Elster BK-G4MT Gas Meter

The image shows a diaphragm gas meter of the BK-G4MT series, manufactured by Elster. Elster is a historical German brand that established itself as a global leader in gas measurement technology. This specific model is commonly used in residential and commercial buildings throughout Europe to track natural gas consumption in cubic meters.

Originally founded in Germany as Elster & Co, the company became a cornerstone of the European smart metering landscape. The manufacturing of these units traditionally took place in Germany (notably in Mainz-Kastel), though international production hubs have been utilized over the decades as the company expanded.

In 2016, Elster was acquired by the American multinational conglomerate Honeywell International Inc. in a major strategic deal. Today, while the Elster name remains a hallmark of precision engineering in the utility sector, the brand is part of Honeywell's Smart Energy business unit, headquartered in North Carolina, USA.