A power measurement device for lamps and other small equipment.
This item is described as a 'lamp parameter tester' however can be used for a variety of electrical equipment up to 10 amps / 2500 watts.
The top has a socket for a lamp directly, but also has a multi purpose power outlet on the back where other equipment can be connected.
This item was imported from China, and although perfectly functional, the socket on the rear does not comply with BS1363 so in theory should not be used in the UK.