What is this device? (Constant level device?)
Thanks Joseph. Knowing that it is a Fi-Streem product, I called/emailed them and got an answer from their friendly support tech. From his email response: [This] is a "Switch Level Device, front" that is used in conjunction with an older series Fi-Streem (Fisions) Still, which is no longer manufactured. The part number for this item is, 06756."