Now you can check just how much of the electricity you can use at a campsite when you use an electric hook-up. This handy app can be used to list all your electrical equipment such as lights and heaters and all you need to do is add the current or wattage from the appliance label. Enter all of your camping equipment so see how much you can use at once. Watch the meter as you add the electrical items to work out the best configuration. Easy to follow with an email option to keep a list for next time or for each campsite you visit as they can have different current and voltage ratings. Can be used worldwide.