Level of liquid in tanks, boiler feedwater systems, and other liquid storage facilities is represented by means of a sight glass connected mechanically to the vessel. This can be either a flat gauge pad or a tubular glass indicator attached by means of a valve set.

Pressure gauge manufacturers represented include Weksler, McDaniels, Dwyer, and Orange Research. Pressure gauges used to indicate (direct) internal line pressure on a vessel or pipeline are constructed from a variety of materials dependent on the application. Dial sizes, connection location, construction materials and ranges specified by user.

Bi-metal thermometers indicate temperature by means of a mechanical connection to dissimilar metals in the probe. Available in numerous dial sizes, connection locations, and temperature ranges as required.

Dwyer Instruments produces a variety of measuring and control instrumentation for pressure, temperature, level and flow regulation and control. Brand names supplied by Dwyer include: Magnehelic, Capsuhelic, Rate-Master, W.E. Anderson & Mercoid.

John C. Ernst Co. provides products used in measuring and controling flow and level in gasses, liquids, and steam. From mechanical flow meters and visual sight flow indicators to liquid level valves and glasses, John C. Ernst has most materials and configurations in stock for same day shipment.