Goa'uld page turning device
From The Stargate Omnipedia
A dark stone shaped much like Asgard control stones, which is capable of turning pages on a Goa'uld tablet as it is passed over the device.
Page-turning devices can conceal objects, such as Ma'chello's Goa'uld killers.
Brief Candle - Jackson discovers one of Pellos' ancient Goa'uld tablets along with a page-turning device.
Legacy - Daniel uses the page-turning device on a Goa'uld tablet and is unknowingly infected with Ma'chello's Goa'uld killers.