Lufkin 2-Foot One Piece Steel Ruler (622FT) The two nib sponges are

The two nib sponges are shaped to fit into any two of the six part wells and can be wetted for convenient wiping away of burnt flux and other material that builds up on soldering iron tips

Built in battery level meter displays the remaining life of the alkaline battery

Backlit control (using Arduino Digital Pin 7)

and a stand

Lufkin 2-Foot One Piece Steel Ruler (622FT) The two nib sponges are1 16 Inch x 1 1 4 Inch x 2 Feet steel rule Bold markings, deeply etched and permanent are black filled Heavier than on machine divided rules Large graduations, marked both sides, both edges Upper edge graduated in 1 8ths, lower edge in 1 16ths