GW GCM-407 Digital Clamp Meter


Product Tags:
Product Tags:
GW GCM-407 Digital Clamp Meter
  • 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)

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



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


  GCM-403 GCM-407
Range 4V, 40V, 400V, 600V 6V, 60V, 600V, 750V
Resolution 0.001V, 0.01V, 0.1V, 1V 0.001V, 0.01V, 0.1V, 1V
Accuracy ±(1.0 + 5) ~ ±(1.2 + 5) ±(1.2 + 5) ~ ±(1.5 + 5)
Input Impedance ≧10MΩ // 100pF at least ≧10MΩ
Frequency Response 40~400Hz 40~400Hz
Range 40A, 600A 6A, 60A, 600A
Resolution 0.01A, 0.1A 0.001A, 0.01A, 0.1A
Accuracy ±(2.5 + 5) ~ ±(2.5 + 8) ±(2.5 + 5) ~ ±(2.5 + 30)
Frequency Response 50~60Hz 50~60Hz
Range 400mV, 4V, 40V, 400V, 600V 600mV, 6V, 60V, 600V, 1000V
Resolution 0.1mV, 0.001V, 0.01V, 0.1V, 1V 0.1mV, 0.001V, 0.01V, 0.1V, 1V
Accuracy ±(0.8 + 1) ~ ±(1.0 + 3) ±(0.8 + 1) ~ ±(1.0 + 8)
Input Impedance ≧10MΩ ≧10MΩ
Range 40A, 600A -
Resolution 0.01A, 0.1A -
Accuracy ±(2.0 + 5) -
Range 400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ, 40MΩ 600Ω, 6kΩ, 60kΩ, 600kΩ, 6MΩ, 60MΩ
Resolution 0.1Ω, 0.001kΩ, 0.01kΩ, 0.1kΩ, 0.001MΩ, 0.01MΩ 0.1Ω, 0.001kΩ, 0.01kΩ, 0.1kΩ, 0.001MΩ, 0.01MΩ
Accuracy ±(1.0 + 2) ~ ±(1.5 + 2) ±(1.0 + 2) ~ ±(1.5 + 5)
Range 4V 6V
Resolution 0.001V 0.001V
Open-circuit Voltage Approx. 1.48V Approx. 3.3V
Range 400Ω 600Ω
Resolution 0.1Ω 0.1Ω
Accuracy The buzzer turns on for resistance lower than 10Ω The buzzer turns on for resistance lower than 30Ω
Open-circuit Voltage Approx. 0.45V Approx. 1.2V
Range 40nF, 400nF, 4uF, 40uF, 100uF 99nF, 999nF, 9uF, 99uF, 999uF, 9mF, 59mF
Resolution 0.01nF, 0.1nF, 0.001uF, 0.01uF, 0.1uF 0.01nF, 0.1nF, 0.001uF, 0.01uF, 0.1uF, 0.001mF, 0.01mF
Accuracy ±(4.0 + 3) ~ ±(5.0 + 10) ±(4.0 + 5) ~ ±10
Range 10Hz, 100Hz, 1kHz, 10kHz, 100kHz, 1MHz, 10MHz -
Resolution 0.001Hz, 0.01Hz, 0.1Hz, 1Hz, 10Hz, 100Hz, 1kHz -
Accuracy ±(4.0 + 3) ~ ±(5.0 + 10) -
NCV (Non-Contact Voltage) 
Distance - < 10mm
Sensing - AC Voltage only 
Range -40˚C ~ 1000˚C -
Accuracy ±(2.5 + 3) ~ ±(8.0 + 5) -
  Data Hold, REL Data Hold, MAX/MIN, REL, Backlight, Flashlight
  Liquid crystal display: Displays 4000 counts maximum. Liquid crystal display: Displays 6000 counts maximum.
  28mm Maximum 30mm Maximum
  9V battery (16F22) 3 AAA 1.5V zinc manganese batteries
  210 (L) x 76 (W) x30 (H) mm; Approx. 260g  228 (L) x 77 (W) x41 (H) mm; Approx. 265g (inclusive of the battery)


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  • GW GCM-407 Digital Clamp Meter