Prostat PFM-711B and ESD Check Model 715B Static Field Meters

Need to Measure Electrostatic Fields up to 20,000 volts?
Our PFM-711B and Model 715B Static Field Meters are portable, hand-held instruments capable of making electrostatic field measurements in areas where ionized air is present.
The PFM-711B measures from 0 to 1,999V in 1 volt increments and from 0 to 19,99 volts in 10 volt increments.
The Model 715B measures from 0 to 19,99 volts in 10 volt increments.

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what about the polarity and sensitivity range/distance???