• 3-pole Fall-of-Potential earth testing for basic measurements
• 2-pole resistance measurements for added versatility
• Easily capture values with single-button operation
• Ensure accurate measurements with automatic ‘noise’ voltage detection
• Hazardous voltage warning offers increased user protection
• Clearly read and record data with a large, backlit display
• Rugged holster and design for tough work environments
• Portable size allows for easy transportation
• Instantly be alerted to measurements outside of your set limit, when you use the adjustable limit setting
• 600 V Cat II

Fluke 1623

• One-button measurement concept
• 3- and 4-pole earth ground measurement
• 4-pole soil resistivity testing
• Selective testing, no disconnection of ground conductor (1 clamp)
• Stakeless testing, quick ground loop testing (2 clamps)
• Measuring frequency 128 Hz

Fluke 1625

• 3- and 4-pole earth ground measurement
• 4-Pole soil resistivity testing
• 2-pole resistance measurement AC
• 2- and 4-pole resistance measurement DC
• Selective testing, no disconnection of ground conductor (1 clamp)
• Stakeless testing, quick ground loop testing (2 clamps)
• Earth impedance measurement at 55 Hz
• Automatic frequency control (AFC) (94, 105, 111, 128 Hz)
• Measuring voltage switchable 20/48V
• Programmable limits, settings
• Continuity with buzzer

• A wide ground loop resistance range, from 0.025 O to1500 O, to satisfy all requirements
• Large jaw opening of 35 mm (1.38 in) for tests on ground conductors and/or equipotential bus bars
• Measurement of ground leakage current, from 0.2 mA to 1000 mA, without needing to disconnect - ideal for system troubleshooting
• Wide ac current measurement range from 0.2 A to 30 A allows one instrument for multiple applications
• User-defined HI / LO Alarm limits, for rapid measurement evaluation
• Handy ‘display hold’ button for capturing readings in hard-to-reach places
• Time saving memory function automatically records and stores measured values
• Automatic self calibration ensures correct measurement every time
• Overload protection: 200 A
• Carrying case and resistance test loop included
• = 8 hours battery life (continuous operation)