Non-Metallic Contact Voltage Detector with Battery Life Indicator
Hioki leads the industry in non-metallic contact test and measurement
technology that promotes safety on the worksite. The 3120 is a
non-metallic contact voltage detector with a power switch that
also gives a clear indication of the battery state with a green
LED. When voltage is detected, the LED lights red along with an
audio signal.

Model No. (Order Code)



CAT IV 1000 V

Key Features

• Top “primary supply level” safety class rating for voltage detectors
• CAT IV 1000 V design meets CE Mark qualifications
• Continuously indicate battery status with green indicator lamp
• Both visual and audible voltage detection indication
• Automatic power switching prevents battery discharge

If a malfunction is suspected

Although the following phenomena, which are unavoidable in the detection principle, can be observed, the instrument has no malfunction.

The instrument incorrectly detects metalware including steel desks as live.

Metalware close to AC power may charge AC potential (induced potential) to ground due to the influence of electrostatic capacitance, resulting in incorrectly detecting.

If the instrument is rapidly moved closer to or away from non-live circuits or DC circuits, the instrument detects live state temporarily.

The non-live circuits or DC circuits may charge static electricity, temporarily resulting in incorrectly detecting.

Basic specifications

Measurement functionVoltage detection
Measurement voltage70 to 1000 VAC, 50/60 Hz (when in contact with an IV 2 mm^2 or equivalent insulated wire)
Pilot lightThe red LED lights up and the buzzer sounds when the wire is live
Battery checkGreen LED
Power supplyR03 (AAA) manganese or LR03 (AAA) alkaline battery ×2, Continuous use: 200 hr (using the LR03 batteries)
Dimensions and mass149 mm (5.87 in)H × φ 18.5 mm (0.73 in), 38 g (1.3 oz)
AccessoriesInstruction manual ×1, R03 (AAA) manganese battery ×2 (for trial purposes only)
Catalog: VOLTAGE DETECTOR 3120Download PDF  [1MB]English

For more information, click here