I bought some of these:

http://cgi.ebay.co.uk/52MM-SMOKE-FAC...d=p3286.c0.m14

It came with a dead sender and the seller is being difficult. I just wanna replace it. Know if it is a 3-160 ohm unit?

 

you'll need to know the manufacturer of the unit and order a sender. They all differ due to resistance

the problem is they look like a cheap chinese import which will probably give you an inaccurate reading anyhow - i learnt my lesson the hard way!