“Zero” and “Span” potentiometers provide the flexibility to range the meters in both the negative and positive directions. Examples: Temperature transducer 0 to 5 VDC equals -40 degrees Fahrenheit to +250 degrees Fahrenheit. Pressure transmitter 0 to 10 VDC equals 0 to 15,000 PSI. C-Ton’s series of rangeable meters is available in both 3.5 and 4.5 digit versions, allowing a wide spectrum of resolution options.