LED Testers

LED testers are devices built to test the polarity (positive or negative) of LEDs with no risk of damage. The device is made up of two test probes and two indicator LEDs. The LED that undergoes the test is connected with the probes, and the cathode (negatively charged electrode) is pinpointed by the LED closest to the connection. 


What are LED testers used for? 

LED testers can be used to test all conventional LEDs. They can also test zener diodes, and complete basic diode tests on bipolar transistors, as long as the test current isn't too high. The only types of LEDs that cannot be tested are flashing and constant-current types as these contain added circuitry. 


How can you test LEDs?

 Follow these simple steps to find out if your device is working correctly: 

  • Switch the unit on. Both attached LEDs should light up. 
  • Connect a diode between the two leads to distinguish one LED light.  
  • Reverse the polarity of the diode and check that the other LED remains on.
  • Repeat this process with an LED. If the same test results show, and both lights remain on, your test has been successful.

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Description Price LED Mounting Types Compatible With Maximum Test Current Minimum Test Current Power Supply Types
RS Stock No. 721-1478
Mfr. Part No.OS10040D
TWD318
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Lead Wire, PCB Surface Mount, PCB Through Hole 100mA 1mA 9 Volt Battery, 9 Volt Power Supply