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It's a sistrum and a bowl (patera or phiale) used for libation. The sistrum, a musical instrument used as a rattle, isn't restricted to the cult of Isis; you may encounter it also in the context of the cult of Mithras, too. See also the Encyclopedia Britannica on the sistrum.
For the sistrum, cf. this statue of Isis:
Photo taken by Marie-Lan Nguyen (2006), Public domain, via Wikimedia Commons
For the libation ceremony, cf. this statue of a priest in toga offering libation:
Picture by Wolfgang Sauber (GFDL or CC BY-SA 3.0), via Wikimedia Commons