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GCM-403 - Digital Clamp Meter

Digital Clamp Meter

GW Instek

Category : Clamp Meter

$82 (CAD)
$55 (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 4V, 40V, 400V, 600V
Resolution 0.001V, 0.01V, 0.1V, 1V
Accuracy ±(1.0 + 5) ~ ±(1.2 + 5)
Input Impedance ≧10MΩ // 100pF at least
Frequency Response 40~400Hz


Range 40A, 600A
Resolution 0.01A, 0.1A
Accuracy ±(2.5 + 5) ~ ±(2.5 + 8)
Frequency Response 50~60Hz


Range 400mV, 4V, 40V, 400V, 600V
Resolution 0.1mV, 0.001V, 0.01V, 0.1V, 1V
Accuracy ±(0.8 + 1) ~ ±(1.0 + 3)
Input Impedance ≧10MΩ


Range 40A, 600A
Resolution 0.01A, 0.1A
Accuracy ±(2.0 + 5)


Range 400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ, 40MΩ
Resolution 0.1Ω, 0.001kΩ, 0.01kΩ, 0.1kΩ, 0.001MΩ, 0.01MΩ
Accuracy ±(1.0 + 2) ~ ±(1.5 + 2)


Range 4V
Resolution 0.001V
Open-circuit Voltage Approx. 1.48V


Range 400Ω
Resolution 0.1Ω
Accuracy The buzzer turns on for resistance lower than 10Ω
Open-circuit Voltage Approx. 0.45V


Range 40nF, 400nF, 4uF, 40uF, 100uF
Resolution 0.01nF, 0.1nF, 0.001uF, 0.01uF, 0.1uF
Accuracy ±(4.0 + 3) ~ ±(5.0 + 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 -
Sensing -

Temperature (•C Only)

Range -40˚C ~ 1000˚C
Accuracy ±(2.5 + 3) ~ ±(8.0 + 5)

Other Function

Data Hold, REL

LCD Display

Liquid crystal display: Displays 4000 counts maximum.

Clamp Opening Diameter

28mm Maximum

Power Source

9V battery (16F22)

Dimensions & Weight

210 (L) x 76 (W) x30 (H) mm; Approx. 260g 

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