trying to test polarity of laser diode

[bpgoss1]

Multimeter does not have diode test function.

http://www.ebay.com/itm/250mW-405nm...560?pt=LH_DefaultDomain_0&hash=item3f25ee3810

 

[Harald Kapp]

You should read the seller's description:

Module : 12mm diameter x 30mm length with acrylic lens
Lead wire 30cm(Red plus[+], Black minus[-]) with 2.5mm pitch Connector.

 

[bpgoss1]

thanks

how silly of me. thank you very much.