I would wonder if a combo unit this small would be very effective.

Usually a TENS needs to be used for 20 minutes or more, and that unit would need to be held on the area for a length of time..

The small surface of the laser would seem mainly helpful for very small areas of pain.

So, depending on how large or small your pain area is, and if it would be easy/comfortable to hold on that area for extended times...

If you haven't tried a TENS or laser yet, I'd find a chiropractor or PT that uses them and try them out that way before buying anything, it may or may not help for your pain.