http://www.netzerotools.com/fluke-435...

Fluke 435 3-Phase Power Quality Analyzer is designed to locate, predict, prevent and troubleshoot problems in three- and single- phase power distribution systems.
Features

Troubleshoot real-time: Analyze the trends using the cursors and zoom tools—even while background recording continues
Highest safety rating in the industry: 600 V Cat IV/1000 V CAT III rated for use at the service entrance
Automatic transient mode: Captures 200 kHz waveform data on all phases simultaneously: Up to 6 kV
Fully Class A compliant: Conduct tests according to the stringent international IEC 61000-4-30 Class A standard
Measure all three phases and neutral: With included four current probes
AutoTrend: Every measurement you see is always automatically recorded, without any setup
System-monitor: Up to seven power quality parameters on one screen according to EN50160 power quality standard
Inrush mode: For troubleshooting nuisance circuit breaker tripping
View graphs and generate reports: With included analysis software
Logger function: Configure for any test condition with memory for over 400 parameters at user defined intervals
Mains signaling: Measure interference from ripple control signals at specific frequencies
Battery Life: Seven hours operating time per charge on NiMH battery pack
Warranty: Rugged, handheld troubleshooter with Fluke three-year warranty