this little gadget can be purchased on Amazon or in some local stores...I found this about 4 years ago in the grocery store and it is for trimming hair...great for blending in a HP after the initial cut with clippers.

You can also use a razor comb like this favorite of mine from Sally's but the little ConAir comb is so much easier to control the cut as you are creating your cut-in:

this is what i use to thin unit hair for the guy that asked in another thread

I am the guy, and thank you so much for the tip. I get good results with thinning shears, but nothing like your razor comb. Thanks again.

Jeff, I live in the UK. Can I get this here? I've tried searching but to no avail a thinning comb is vital to getting a good blend, as I wear a partial.

I've seen it at Walgreen's Drug Stores here in the states but I'm not sure where you can find it in the UK.
Regards,
John
http://toplace/

Why not just contact them [Conair] via their website and ask how you can get one ?www.conair.com ..just `lift`the pic above and send that to them with your e mail ..they will then know exactly what you want......they have hair-cutting kits available but I didn`t see that particular item on it`s own, nor is is obvious as part of a kit, but you can ask them.Paul.

Cheers , I'll try contacting them.