Question

what is the equipment marked with the arrow?
graduated cylinder
stirring rod
erlenmeyer flask
volumetric flask

Explanation:

The equipment marked by the arrow is a long, thin - rod like object used for stirring substances in a container, which is characteristic of a stirring rod. Graduated cylinders are for measuring volume, Erlenmeyer flasks have a conical shape for mixing and heating, and volumetric flasks are for precise volume measurements in solution preparation.

Answer:

stirring rod