The Active Differential Probe ADP1 for the SPECTRAN NF-5035 Spectrum Analyzer offers potential free measurements and expands the analyzer’s measurement range up to 240V. With this probe the signal will not be influenced (potential free measurement). It also protects the SPECTRAN Spectrum Analyzer input against high voltages up to 1400V (CAT3). It’s a “must have tool” for direct cable-measurements on DSL, ADSL, VDSL, free running oscillators, AC mains etc. Included in delivery is a special grounding kit which protects the unit against static electricity (ESD) probes and 4-AA batteries.