Extech Oscilloscope 20MHz 2 Channel Digital Handheld - MS420

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This 2 channel digital handheld oscilloscope has a bandwidth of 20MHz and a storage function of up to 4 waveform screens and setups. Also comes with PC interface for further analysis and manipulation of data.

Extech Oscilloscope 20MHz 2 Channel Digital Handheld - MS420

With a 3.8” (96mm) color LCD display simplifies viewing multiple waveforms and a 20MHz bandwidth


  • Auto-set function optimizes the position, range, timebase and triggering to assure a stable display of virtually any waveform
  • Peak Detect function for 50ns glitch capture helps to quantify peaks and abnormalities
  • 20MHz bandwidth encompasses a wide range of waveforms
  • XY Mode
  • Five automatic measurements: Frequency, Duty Cycle, Average, Peak to Peak and RMS
  • Waveform math abilities include addition, subtraction, multiplication and division
  • Average Mode for smoothing waveforms
  • Persistence Mode for observing dynamic signals
  • Store and recall up to 4 waveform screens and setups
  • Comes complete with two 1X/10X oscilloscope probes, test leads, Windows compatible software, capacitor measuring module, adjustment screwdriver, universal AC adaptor and a rugged carrying case
  • USB interface and PC software for transferring waveforms and data to your PC for further analysis and manipulation

An oscilloscope produces a graphical display of constantly varying signal voltages. With time as the X axis and voltage as the Y axis you can measure practically any signal which can be converted to a voltage. Oscilloscopes are vital to electronic testing, medical applications, engineering and telecommunications.

The most common application of an oscilloscope is for troubleshooting malfunctioning electrical equipment. This is done by “probing” an electrical component for an expected signal. If the signal matches what is expected the equipment is working correctly, if a flawed or non-existent signal is received then the equipment is malfunctioning.

Progressive signal probes are used to isolate faults in the electronics which are then fixed and isolation of other faults can begin. Another use of an oscilloscope is to test newly designed circuitry. Problems with these include bad design, incorrect voltages and electrical noise. The storage capacity of this oscilloscope is useful for tracing unusual waveforms and unexpected events usually found when troubleshooting new circuitry. A skilled technician can sometimes determine the offending component based purely on the picture developed.

This hand-held oscilloscope is ideal for field applications and testing of audio-frequencies. With a rugged outer casing and a dual channel display the comparison of differing waveforms has never been easier. With a rugged carrying case to safely transport to any job site.

This oscilloscope also features the functioning of a Multimeter, being able to test AC and DC Voltage and Current, Resistance, Capacitance, diode and continuity. This instrument is easily connected to a PC for further analysis and manipulation of the data. The MS420 Digital Oscilloscope User Manual is attached to this page to answer any further questions.


  • Oscilloscope Functions
    • Display Size: 3.8" (96mm) color LCD; 320 x 240 pixels
    • Bandwidth: 20MHz
    • Real time sample rate: 100MS/s
    • Rise time: 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: 7 x 4.4 x 1.6" (180 x 113 x 40mm)
  • Weight: 24.3oz (690g)

Unit Ship Weight: 4 lbs

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