- Hioki Model # 3129
- Live wire check (R-S/ S-T only)
- Bright LED and buzzer indicate phase direction
- Easy clamping over insulated wires of up to 17mm in diameter
- Low battery warning and auto power off
- Voltage Detection: Electrostatic Induction Method
- Voltage Range: 70V to 600V AC (50/60 Hz) (sine wave, continuous input)
- Clamp Diameter: 17mm max. of insulated wire
- Display: Phase Detection: Positive 4 LEDs lit in clockwise order and 3 short beeps, Negative 4 LEDs lit in counter clockwise order and 1 beep, Live wire check: R-S and S-t will light if voltage between wires are within range
- Battery Check: On lamp blinks to indicate battery low status
- Auto Power Off: Auto shut off if no activity is detected after 15 min
- Power Supply: Two “AA” batteries continuous use approx. 70 hours
- Operating Temp: 32-104 degrees F 80%RH
- Storage Temp: -4 to 140 degrees F 80%RH
- Standards: Cat III 600V
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Return Policy
FourToolz accepts returns within 30 days of delivery for items that are unused, in their original packaging, and include all accessories.
Customers are responsible for return shipping costs unless the product is defective or incorrectly shipped.
For detailed information, please review our full Return Policy or contact us at sales@fourtoolz.com.







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