We think these limited edition Hendricks gin scales were limited to a production run of just 1000 units. They were designed to make the distinctive black gin bottles more visible in bars and restaurants. The scales measure the contents of the bottle and have an indicator to let bartenders know when the bottle needs replacing. These scales are no longer produced, meaning they're quite hard to come by. Due to their limited availability, they are sought after and as such, regarded as a collectors item.