Instructions
Rate detectors by what you will be hunting. A metal detector intended for underwater use by scuba divers, for example, will have different capabilities from one used to find old coins on land. If you plan to hunt primarily for one type of material, you might consider a specialty detector.
Rate detectors based on where you will be hunting. Some areas or terrains may limit the use of a pole-mounted detector and require you to strap it to your person. (This is called a belt/body mount.) Take into consideration the conditions under which you will be hunting and how much weight you can reasonably carry. Is the area dry and dusty or wet and humid? Will you be hunting in residential areas or in a more rugged and less accessible area? Will you have to climb or hike?
Consider the ground condition where you will be hunting. If you plan to encounter a variety of ground conditions in your hunts, an all-purpose detector might be a good choice, but this detector will probably not perform so well in extreme conditions.
Know exactly what you are rating when you rate detectors by price. The most expensive units are not necessarily superior in performance to less expensive units. They may cost more simply because of a special function that might not really improve their ability to detect. Identify your needs before you spring for a fancy model.
Know your skill level. Detectors for beginners are often suitable for use in different environments and conditions, which will help determine where you are most comfortable and what you prefer to hunt for. More features will not help you learn and might even be a hindrance.
Read catalogs, request data sheets from manufacturers and read as much literature as you can on your prospective purchase. Read this information with a critical eye and make your own comparisons based on your own usage and needs. Don't be afraid to call a manufacturer and ask some questions.