When you go out searching for treasure with your metal detector, you need more than just your detector to really be comfortable and successful in finding targets. Here's a list of some other metal detecting tools that you'll find useful:
Headphones: these are essential if you do not want to miss some of the very slow signals that your machine will emit. If you're searching in a very noisy area such as a beach then it's also imperative to have some headphones.
Pinpointer: this is like a tiny version of your metal detector. It's a tool that can be used to locate your targets when you are actually digging a hole. Sometimes you're not sure if the targeted item is to the side of the hole, in the dirt pile around the hole or at the bottom. A pinpointer will save you time and energy by telling you exactly where it is.
Digging Tools: you can use any old garden trowel for digging, although there are specialized metal detecting trowels available. It's essential that you have something to dig with. However, you do not always have to excavate a hole the size of the Big Hole in Kimberley to get your target. You should always aim to have minimal impact and many smaller targets can be attained by using a probe, or a slim long piece of metal such as a screwdriver. A long sharp knife to cut through the soil is also very useful. Another good idea is to have a digging cloth that you can dump soil from your hole onto. A dark colored cloth is a good backdrop to allow you to more easily spot gold or silver items. Otherwise, you'll find that your goals often get "lost" in the grass or soil once you've dug them up.
Sand Scoop: If you're detecting on the beach then a sand scoop is absolutely critical. You want something that is not going to corrode with all the salt in the air. A tough plastic scoop is perfect. It should have holes that allow the sand to escape but keep your treasures behind.
Magnifying glass or loope: Once you've found an item you want to identify it. A magnifying glass will enable you to see dates on coins, or designs on metal plates.
Treasure Containers: Some detectors prefer putting their finds into a pouch on their person. Others use a bag, or even a plastic container. A fishing tackle box with all its separate compartments is quite a useful way of organizing your finds when you're out in the field. Its up to you what your personal preference is.
Also remember to bring a bag for any rubbish that you dig up. You should always take this with you.
Protective Gear: Gloves are important to protect yourself from any broken glass or metal that could cut you when you're digging up your finds. You might also want to consider kneepads, especially if you're detecting on the beach. If the weather is sunny, then a sun hat is essential.
Headlamp or Torch: even if you're not hunting at night, there might be dark corners or dank holes that you need to have a look at.