Be very careful when purchasing test equipment. I bought a test bar from a well known advertizer, it was so inacurate as to be unusable. In fairness, he did give a refund without a quible.
Be sure to get an assurance that the item is manufactured in the UK, Western Europe, or USA. Other sources may be OK but are questionable.
Try Arrand, The Forge, Knossington, Nr Oakham, Leicestershire, LE15 8LN. 01664 454566. I have dealt with this British firm & found them helpful & their products good.
Peter Gain.