Probes with a diameters of 0.005" or 0.010" provide the quickest time constant typically less than 0.3 seconds.

Probes with a diameters of 0.020" or 0.032" has a slower time constant typically 1 second or less but have greater long-term durability.

All probes are uninsulated and are not recommended for use with aqueous solutions (Keep probe wire from touching to prevent a false junction).