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Extech VT30: LCD Multifunction Voltage Tester

Voltage, Continuity and Phase Tester with Flashlight and backlit digital Display with bargraph

The VT30 is a voltage, continuity and phase tester with built in flashlight and backlit digital display with bar graph. The tester features a double molded IP64 housing, polarity detection with LEDs for positive and negative DC and a CAT III 600 Volt / CATIV 600 Volt safety rating. This product is complete with a one year warranty, 2 AAA batteries, protective cap, and pouch case.



  • Large backlit LCD display
  • AC voltage (0 to 480V) and DC voltage (0 to 690V)
  • Polarity detection with LEDs for positive and negative DC
  • Continuity Test with audible tone
  • Phase rotation test for motors
  • Two handed operation for low impedance testing
  • Built-in flashlight for testing in tight areas
  • Rubberized double-molded IP64 housing


Specifications Range
LCD display 1999 counts (3-1/2 digits) with bargraph and backlight
Resolution 1 Volt
AC Voltage range 0 to 480V
ACV frequency range 50/60Hz
DC Voltage range 0 to 690V
Accuracy ACV ±(1.5%rdg + 5d); DCV ±(1.0%rdg + 3d)
Range selection Automatic
Max measuring current ≤1.0mA (400VAC); ≤1.5mA (690VDC)
Response time Updates 2-3 times/sec
Input Impedance 1MΩ (approx)
Continuity test Range 0 to 200kΩ, guaranteed on < 50kΩ;
Overvoltage protection 480VAC/690VDC
Low impedance test 12-250VAC/DC; impedance <6kΩ;
LCD enable input voltage >4.5V AC/DC
Operation time: 5s <250V AC/DC
Power supply 2 x “AAA” 1.5V alkaline batteries
Battery life Approx. 8 hours continuous use typical
Operating Temperature 14 to 131° F (-10 to 55° C)
Storage Temperature -22 to 140° F (-30 to 60° C)
Operating Humidity 10 to 85% RH (non-condensing)
Dimensions 9.4 x 3 x 1.6″(240 x 78 x 40mm)
Weight 9.2oz (260G)


VT30 English Datasheet

VT30 English User’s Manual

VT30 CE Declaration of Conformity