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Attach your test load to your driver output (the end with resistor goes to + and the other end goes to -) Then you should put your multimeter to voltage. Try using the lowest possible value available.

Well.. to put it out short: highly dangerous, invisible and thus mostly useless stuff - ofcourse ;) Whadd'ya thought? Edit. I found some current calculator tool and made an regulator with it (see attachment). Now my question: will this schematic work or shall I use another one? Also, which one...

So, I bought 3 of these: Wavelength : 808±10nm Power Output : CW 300mW Working Current(mA) : ≤400mA Working Voltage(V) : 2.2V Working Temperature ( ℃ ):－10~＋40 Threshold Current (mA):≤120 Beam Divergence (deg): Θ// :17 . Θ⊥38 . Sealed Size : TO18(5.6mm) Life span : >10000 hours Now Im...