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GCM-407 - Digital Clamp Meter with True RMS Measurement

Digital Clamp Meter with True RMS Measurement

GW Instek

Category : Clamp Meter

$102 (CAD)
$69 (USD)
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Users Manual Datasheet


Digital Clamp Meter -- ACA, ACV, DCV, Ohm, Diode, Buzzer.

The GCM-403 is digital clamp meter can measure AC/DC voltage, AC/DC current, resistance, diodes, continuity, capacitance, frequency and temperature.  Tapered jaws, auto range, data hold, REL function and auto power off which makes it a superb tool for electricians. 

The GCM-407 is digital clamp meter with true RMS measurement. Featuring tapered jaws, a wide range (AC 600A/750V, DC 1000V max input), capacitance measurement as well as non-contact voltage sensing function and the ability to keep MAX/MIN or hold data  and automatically power down make the GCM-407 suitable for almost any cable measurement task.


New Old Description
GCM-403 GCM-302

Compared with the old model- Advantages

GCM-403 expanded measurement items: 
DCA/Capacitance/Temperature/Frequency Counter and expanded functionalities: REL, Data Hold

Compared with the old model- Disadvantages

Smaller GCM-403 Clamp which is only ∮ 28mm

GCM-403 does not have Max Hold

GCM-407 GCM-303

Compared with the old model- AdvantagesGCM-407expanded measurement items: Voltage Range/Capacitance and expanded functionalities : No Contact Voltage (AC only)/ Min Hold/REL/Backlight

  • Auto Range, Expect Current Measurement
  • Auto Power Off
  • Max Hold
  • True RMS Measurement (GCM-407)
  • (AC)600A/600V Max Input (GCM-403)
  • (AC)600A/750V Max Input (GCM-407)
  • Mini Size
  • High Accuracy
  • MAX Clamp Size: 28mm (GCM-403)


Range 6V, 60V, 600V, 750V
Resolution 0.001V, 0.01V, 0.1V, 1V
Accuracy ±(1.2 + 5) ~ ±(1.5 + 5)
Input Impedance ≧10MΩ
Frequency Response 40~400Hz


Range 6A, 60A, 600A
Resolution 0.001A, 0.01A, 0.1A
Accuracy ±(2.5 + 5) ~ ±(2.5 + 30)
Frequency Response 50~60Hz


Range 600mV, 6V, 60V, 600V, 1000V
Resolution 0.1mV, 0.001V, 0.01V, 0.1V, 1V
Accuracy ±(0.8 + 1) ~ ±(1.0 + 8)
Input Impedance ≧10MΩ


Range -
Resolution -
Accuracy -


Range 600Ω, 6kΩ, 60kΩ, 600kΩ, 6MΩ, 60MΩ
Resolution 0.1Ω, 0.001kΩ, 0.01kΩ, 0.1kΩ, 0.001MΩ, 0.01MΩ
Accuracy ±(1.0 + 2) ~ ±(1.5 + 5)


Range 6V
Resolution 0.001V
Open-circuit Voltage Approx. 3.3V


Range 600Ω
Resolution 0.1Ω
Accuracy The buzzer turns on for resistance lower than 30Ω
Open-circuit Voltage Approx. 1.2V


Range 99nF, 999nF, 9uF, 99uF, 999uF, 9mF, 59mF
Resolution 0.01nF, 0.1nF, 0.001uF, 0.01uF, 0.1uF, 0.001mF, 0.01mF
Accuracy ±(4.0 + 5) ~ ±10


Range -
Resolution -
Accuracy -

NCV (Non-Contact Voltage)

Distance < 10mm
Sensing AC Voltage only 

Temperature (˚C Only)

Range -
Accuracy -

Other Function

Data Hold, MAX/MIN, REL, Backlight, Flashlight

LCD Display

Liquid crystal display: Displays 6000 counts maximum.

Clamp Opening Diameter

30mm Maximum

Power Source

3 AAA 1.5V zinc manganese batteries

Dimensions & Weight

228 (L) x 77 (W) x41 (H) mm; Approx. 265g (inclusive of the battery)

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