Although sold under many brand names these generally seem to be £12+ elsewhere.
Includes built-in horizontal and vertical vials in the plastic handle but like many things, it may not do two things very well. If you want to ensure the earth is flat it would be wiser to buy a real spirit level.
Free click and collect from store available, it will take 3-4 days to arrive at store. Delivery to home is quicker but has a cost.