cmdomains is absolutely right. Use search engines to find out which companies do the same business or are in the same industry that your domain describes. Again, for this to be effective, your domain must have certain value for those potential buyers.
Never contact a business offering them a domain that has little or nothing to do with their business, which includes not offering them a domain that does not make sense. The key is to look at your domain objectively.
Most domainers are so focused on selling their name that they don't stop to consider if it has any relevance for the person they are offering it to.