The description and use of a new-invented portable instrument, for detecting frauds in base and counterfeit gold, by shewing the true weight of every piece of gold coin now current, with the quantity of gold and alloy in each, and also of adulteration, if any, it also proves the real value of rings, and other small toys made of gold. These instruments are made and sold, wholesale and retail, by John Warner, of campden

Förlag	År	Ort	Om boken	ISBN
Printed by C. Earl, at No. 50, Dale-End	1773?	England, Birmingham	12p. 12⁰.