What To Look For
Look for a trimmer that is rechargeable. Look for a trimmer that comes with its own charger and at least four sizes of removable combs that regulate beard length. It's also a good idea to have a trimmer that has a very small comb that leaves the beard at the "stubble" level. It should have carbon steel blades and the handle of the trimmer should have a rubberized grip on it for ease of handling. The trimmer should feel solid, not flimsy and delicate.
Common Pitfalls
Avoid buying trimmers that do not recharge. Some trimmers rely on A or AA batteries only. These types of trimmers do not have the power after their initial use of about 20 minutes. The batteries run down too fast and in hot and humid conditions such as showers and bathrooms, the batteries can even corrode.
Where To Buy
The best place to buy trimmers would be at the local Walmart, K-mart or any of the "marts." They have the best selection and the brand names are easily found. Another option is to buy online through Amazon or other reputable online stores. You will get a better deal shopping online if you are willing to wait for delivery.
Cost
You can buy a cordless, battery-only trimmer for about $10. As standards in the industry, Wahl and Braun have trimmers that sell for about $15. They have all the features including chargers and extra comb attachments. For trimmers that will last a lifetime, Norelco and Remington have trimmers with all the features, including some with a small vacuum that cost $30 to $50.
Comparison Shopping
Some trimmers can be immersed in water and even be used in the shower. This makes for convenience and ease of cleanup. However, continuous water immersion can shorten the life of any wet-dry trimmer and the life of the cutting blades. Care must be taken when putting the trimmers away that they do not have water on the blades, as this causes rust to form. Dry trimmers actually work better for some men. Dry trimmers last longer and do not have the problems associated with dull blades from accumulated rust like wet-dry trimmers.
Accessories
Complement your trimmer with some good quality straight-edge razors. They are relatively cheap. Buy the single blade type for shaving under your chin, neck and around the tight corners beside your nose. Trimmers work great, but they can't shave skin smooth like straight-edge razors. If your trimmer did not come with oil, make sure to pick up some light oil and use it sparingly on the cutter head. A good choice would be a high-quality bicycle lubricant. Another item to consider is a nose hair trimmer. These small cylinders work better than anything for reaching pesky nose hair.
Insider Tips
Beard trimmers are not shavers. They will not cut close like straight-edge razors. Try to avoid getting any moisture at on your dry trimmer, as it will drastically shorten the life of the trimmer. Good beard trimmers also work great on hair as well. When you buy your trimmer, make sure you get adjustable combs. With these, you can trim your own unwieldy hair when you trim your beard.
