Which instrument is not required for the inspection and verification of rigid lenses upon receipt from the manufacturer?

The instrument that is not required for the inspection and verification of rigid lenses upon receipt from the manufacturer is the biomicroscope. The primary function of a biomicroscope, or slit lamp, is to provide a detailed view of the anterior segment of the eye, including the cornea and eyelid. While it is a valuable tool for examining the health of the eye and assessing contact lens fit on the eye, it is not specifically designed for evaluating the physical characteristics of contact lenses upon their receipt.

In contrast, a radiuscope is essential for measuring the curvature of the lens, which is crucial for ensuring the proper fit. A lensometer is vital for verifying the prescription and optical properties of the lens. A measuring magnifier is also useful for inspecting the edges and surface of the lenses for any defects. Therefore, among these instruments, the biomicroscope is not essential for the initial inspection and verification of rigid lenses.