The answer - A Watkins Bee Meter

The subject of the last 2 days blips was a Watkins Bee Meter. Judging by the prices on Ebay (1 in better condition than this failed to sell at £12.95 starting price) there were a lot made and still a good supply in the market place.

If you have trouble deciding which metering mode to use read the article on the link above, and you'll realise the progress that has been made.