SPAN
In 1970 SPAN's founder, Leo Whitson, began making the first American-made liquid-filled gauges for the oil patch. Now, the Thuemling Instrument Group carries on the family-owned tradition, remaing committed to supplying the best liquid filled gauges in the industry.
SPAN gauges offer unique features:
- Tough, corrosion-resistant zytel nylon case with removable bezel
- Uniform appearance for all SPAN 2-1/2", 3-1/2", and 4-1/2" stem and panel mount cases
- Internal "breathing diaphragm" which eliminates the need for an air bubble in the mid-range of the gauge
- Compensation for changes in internal case pressure caused by fluctuations in ambient temperature
- Internal diaphragm seal prevents freezing, clogging, and corrosion
- Non-yellowing glycerine fill