Government of India took the congnizance and understood the necessity of protecting the public in its purchases of gold jewellery, especially with regard to standards of fineness and the prevention of adulteration, be it deliberate or accidental. The principle obejectives of the Hallmarking Scheme are to protect the public against the fraud of adulteration and to oblige manufacturers to maintain legal standards of fineness.
Give a brief description for the following certification marks.

Explanation

ISI mark It is certification mark for industrial products in India. The mark certifies that a product conforms to a set of standards laid by the Bureau of India Standards, the National Standard Organisation in India.
(ii) AGMARK It is a certification mark employed on agricultural products in India, assuring that the product is of standard quality approved by the directorate of marketing and inspection, an agency of Government of India.
BIS mark It is a certified hallmark sign on gold as well as on silver jewellery. This sign certifies the purity of metal.
(iv) NSF mark It can be found on millions of consumer, commerical and industrial products. Products, certified by NSF international, include bottled water, food equipment, home appliances, etc.
(v) Energy saving mark It is certified that the product consumers less energy and leads to reduced power bills.