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  • Enabled with current and voltage measurement functions, in a compact size
  • Measures resistance & continuity to check for broken wires
  • Data hold & backlit display to keep you working safe and fast


  • Four electrically isolated inputs
  • CAT III 1000 V / CAT IV 600 V safety rated
  • Choose from 60 MHz, 100 MHz, 200 MHz or 500 MHz bandwidth models
  • Fast sampling rate, up to 5 GS/s with up to 200 ps resolution (Depending on model and channels used)
  • Deep memory: 10,000 samples per channel waveform capture so you can zoom in on the details
  • Dedicated 999 Count digital multimeter.


  • Safety first. Connect the insulation tester then keep yourself out of harm's way by monitoring your test measurements remotely.
  • Prove your job is done right by quickly seeing and sharing insulation resistance test results wirelessly with your smartphone.
  • Quickly find problems by saving and comparing measurements over time on a wireless device.


  • Large display
  • Backlight for work in dim areas
  • Min / Max to record signal fluctuations
  • Ergonomic overmolded housing with integrated probe holders
  • Free your hands with the optional TPAK magnetic hanger
  • Auto and Manual ranging
  • Meets Measurement Category 1000 V CAT III and Category IV 600 V safety standards
The 77 IV replaces the 77. Move up to superior utility and safety today.


  • Now compatible with Fluke Connect mobile app and all Fluke FC enabled test tools with optional ir3000 FC infrared connector (sold separately).
  • Let your team see what you see in an instant with ShareLive™ video call (requires Fluke Connect mobile app and ir3000 FC wireless connector).
  • TrendCapture quickly graphically displays logged data session to quickly determine whether anomalies may have occurred.
  • Limited lifetime warranty.