This nifty little gadget has a chemical compound in its core which changes colour to indicate the UV intensity of the sun - the stronger the colour - the more effective your solar chargers will be at charging your device!

This UV index checker will also keep you safe in the sun - if the colour on the chart shows strong sun, put up your parasol, get in the shade and protect your skin!

Made from tough, rubberised materials it is durable enough to chuck in your beach bag and head out into the sunshine!