Due to the UK being shut off from the European mainland because of the new Covid-19 mutation it is very likely your order will be delayed until further notice. There is nothing we can do about this at this point in time
Precise and precise dimensions are very important for certain purposes, for example when you have a house built, want to know the number of cubic meters of a room or place something completely level. Leica is a real leader in the field of this type of equipment. The German brand makes lasers with which you can perfectly measure the dimensions and content of a room. You can also find lasers that serve as levels. You will not get it right then.