Over a period of time so that the results could be analysed. This would make a superb presentation / display piece. And a thoughtful gift for anyone in the Electrical Industry.This is an uncommonly heavy item so we are asking for. Collection in person from the Skipton area (BD20). However, we are happy to post it via Parcelforce if you are. This item is in the category "Collectables\Scientific Collectables\Scientific Instruments\Other Scientific Instruments". The seller is "attic-fantastic" and is located in this country: GB. This item can be shipped to United Kingdom.