Tank level gauge

The new Ashcroft TC tank level gauge provides liquid level measurement for vented storage tanks or vessels of any shape. The analog dial is scaled exactly to customer requirements, while the 160 mm (6-inch) size provides for easy reading. Indication is separated by an integral capillary line up to 90 feet (27 meters), facilitating the remote mounting of the seal housing. Choice of 316 SS fittings and mounting configurations allow for either external or internal (submerged) installation. The model TC does not require power and is an ideal primary indicator or backup for electronic devices.  

https://www.ashcroft.com