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Martindale VT28 Voltage Indicator

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An upgraded version of Martindale's VT25 voltage indicator, this device includes all of the functions of that device but also includes an integrated LCD display which shows full test values as well as LED indication.

This device is used to give indication of voltage levels (both AC and DC) up to 690V, can be used to test continuity with audible and visual indicators and can also be used to give indications of three phase rotation.

A built-in LED torch on the end of the VT28 also ensures that it can be used in darkened conditions.

Martindale VT28 Voltage Indicator Key Features

  • LCD screen shows full test values
  • LED indicators
  • AC and DC voltage measurements up to 690V
  • Continuity test with audible and visual indication
  • Three phase rotation indication
  • Built-in LED torch

Full List of Products Included

  • Martindale VT28 Voltage Indicator
  • Batteries
  • Instructions

Martindale VT28 Technical Specifications

Voltage Indicator  
Maximum Working Voltage 690V DC & AC rms
Nominal Voltage Threshold Indications 12, 24, 50, 120,
230, 400, 690V AC/DC
Nominal Voltage Threshold Tolerance Conforms to BS
Polarity Indication from 12V DC/AC rms
Range Detection Automatic
Response Time <1s at 1005 of each nominal voltage
Frequency Range DC, 16 to 400Hz
Test Current <3.5mA at 690V
Duty Ratio 30s ON (operated) / 240s OFF (recovery)
Single Pole Phase Test  
Voltage Range 100 to 690V AC RMS
Frequency Range 50 to 60Hz
Phase Rotation Test  
Voltage Range 120 to 400V AC RMS (Phase to Earth)
Frequency Range 50 to 60Hz
Resistance Range 0 to 500kΩ + 50%
Overvoltage Protection 690V DC or AC rms
Operating Temperature -10°C to 55°C
Storage Temperature -20°C to 70°C, non condensing
Humidity Max 85% R.H.
Altitude Up to 2000m
Power 2 x 1.5V, AAA alkaline batteries (IEC LR03,
Battery Consumption 80mA approx.
Dimensions 205(L) x 67(W) x 27(D) mm
Weight 130g approx
Conformity BS EN61243-3:2010 CAT IV 300V, CAT
III 600V
Class II, Double Insulation
Pollution Degree 2
IP Rating IP64
Conformity BS EN61326-1
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Additional Information
Manufacturer Part Code MARVT28

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