MS420 Extech Handheld Digital Oscilloscope

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  • Auto-set function optimizes the position, range, timebase, and triggering to assure a stable display of waveforms
  • Peak Detect function for 50ns glitch capture
  • XY Mode and FFT function to view component frequencies
  • Twenty Automatic Measurements including Frequency, Cycle, Average, Peak to Peak, RMS and more
  • Waveform Math: Add, Subtract, Multiply, and Divide
  • Average Mode for smoothing waveforms
  • Persistence Mode for observing dynamic signals
  • Store and recall up to 4 waveform screens and setups
  • USB interface and software for transferring waveforms and data


  • Display Size: 3.8" (96mm) color LCD; 320 x 240 pixels
  • Bandwidth: 20MHz
  • Real time sample rate: 100MS/s
  • Risetime: 17.5ns
  • Channels: 2
  • Record Length: 6K points per channel
  • Glitch Capture: 50ns
  • Vertical Sensitivity: 5mV to 5V/div
  • Vertical Resolution: 8 bits
  • Timebase Range: 5ns to 5s/div
  • Sample Mode: Sample, Average, Peak Detect
  • Trigger Modes: Free Run, Single Shot, Edge, Video
  • Trigger Source: CH1, CH2
  • Trigger Coupling: AC, DC
  • Input impedance: 1MΩ/20pF
  • Max Input Voltage: 400V (peak)
  • Cursor Measurement: Voltage and time

True RMS MultiMeter Functions

  • AC/DC Voltage: 400mV, 4V, 40V, 400V
  • AC/DC Current: 40mA, 300mA, 20A
  • Resistance: 400Ω, 4kΩ, 40kΩ, 400kΩ, 40MΩ
  • Capacitance: 51.2nF to 100µF
  • Diode and Continuity: Yes
  • PC Interface: USB cable
  • Power Supply: 6 hours Li-ion rechargeable battery; AC?Adaptor/charger
  • Dimensions/Weight: 7x4.4x1.6" (180x113x40mm) / 24.3oz (690g)

Extech's MS420 20 MHz 2-Channel Digital Oscilloscope offers a range of capabilities for effective troubleshooting of electronics and electronically controlled electrical systems. With 20 MHz bandwidth and conveniences like auto-set which optimizes the position, range, time base, and triggering to assure a stable display of virtually any waveform, the MS420 can be used in field repairs or bench duty. To identify subtle problems, Peak Detect features a fast 50 ns glitch capture. Core functions like XY Mode, FFT function, Trigger Hold off, Waveform Math, Averaging Mode and Persistence Mode all ensure you can confidently troubleshoot problems using a variety of approaches. To start up recurring testing routines, you can store and recall up to 4 waveform screens and setups to save time from job to job. This CAT II-rated oscilloscope extends its functionality with complete DMM functions that are displayed on the large 3. 8" (97mm) color LCD display. The MS420 comes with two 1X/10X oscilloscope probes, test leads, Windows XP/Vista compatible USB software and cable, capacitor measuring module, adjustment screwdriver, AC adaptor/charger, hard carrying case, user manual, and manufacturer's one-year limited warranty.

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Frequency20 MHz
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