Nalcometer

Wooden box with metal instrument inside; instructions attached to top of box; instrument has a gauge and three turnable knobs; space along side has a power source and an electrode that is used for measuring; plaque on top left corner identifies instrument, maker, and serial number.

A nalcometer measures the total amount of dissolved solids in water. This nalcometer was used to measure the amount of particulates in the water of steam boilers.