Finding intermittent faults that take out fuses when youa re somewhere else in the shop can be a pain to catch...The point of my light bulb across the breaker/fuse is the light turns ON when the breaker pops and this is very handy when you are elsewhere in the shop and the fuse is on an intermittent circuit.
Cuba: Electricity. Although the power supply in Cuba is mainly 110 volts, most of the modern hotels have dual voltage with all the sockets in the room being 220 volts. Usually in the bathroom there is an 110 volt socket suitable for shavers and charging batteries. A 4 gang 13 amp extension lead could well prove very useful.
Cuba's only mobile phone operator, Cubacel, provides the service of renting SIM cards for tourists to use in their mobile phones, thus providing them with a local mobile phone number while they are in Cuba. The cost of renting a SIM card is 3CUC per day, and to rent a handset costs 6CUC per day. There is no official system for tourists to buy a SIM card in Cuba. If you are using your own handset, it needs to work on the 900MHz frequency band for it to work in Cuba.