RuneScape Classic Wiki
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RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Level 1 Certificate
The Old School RuneScape Wiki also has an article on Level 1 Certificate.

Level 1 Certificate is an item obtained from Examiner during Digsite quest.

Transcript

This article on an item has an associated transcript page.

During or after completing the quest, players may bring the certificate to the Varrock Museum curator along with the Level 2 certificate and Level 3 certificate to get a Fruit blast or a Chocolate cake.