Martindale TEK404 Audible & Visual Continuity Tester

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Martindale TEK404 Audible & Visual Continuity Tester

  • Loud buzzer for noisy environments
  • Bright LED for visual indication
  • Buzzer & LED intensity reduce with increased continuity resistance
  • Low cost continuity tester
  • CAT III 600V compliant


The TEK404 is a compact continuity tester with both audible and visual indicators. The tough design makes it ideal for commercial and industrial environments. It has the added benefit over the TEK402 that it’s enhanced safety rating means that it is suitable for use in BS EN61010 CAT II and CAT III locations. Safety features also include an audible warning if accidently connected to live circuits >30V AC.

The loud 85dB buzzer makes it ideal for use in noisy environments where many continuity buzzers, multimeters or 18th Edition multifunction testers cannot be heard.

There is a convenient belt clip and the TEK404 is supplied with CAT III 1000V rated TL47 test leads.


Probe voltage 9V DC
Test current <50 microAmp (across short circuit)
Continuity range 0Ω to 2.2kΩ
Audible output level 85dB minimum at 30 cm with 0Ω continuity resistance
Features Buzzer and LED intensity reduce with increasing continuity resistance
Alarm function Pulsed buzzer and LED indication if unit is connected to live circuit voltage >30V AC/DC ± 20V
Complies with BS EN 61010-1


BS EN 61326-1


Operating temperature range -10 to 40°C at max 70% RH
IP rating IP40
Supply 9V, MN1604/PP3 alkaline battery
Weight 290g approx.
Dimensions 150 x 64 x 31mm
Includes TL47 test leads, insulated croc clips, battery and manual