operation of the Medtronic Tono-Pen XL Tonometer. Th e Medtronic Tono-Pen XL is a precision electronic tonometer which measures intraocular pressure (IOP). Th e body of the instrument is specially designed to ï¬ t comfortably in the userâs hand, facilitating fast and accurate measurements. Th e stainless steel probe on the Tono-Pen XL contains a
Metamorphic rocks fall into two major categories: foliated metamorphic sedimentary rocks non-foliated metamorphic rocks. Refer to Metamorphic Rock Photos for more visual examples of each of these metamorphic rock types. Foliated (Layered) Metamorphic Rocks 1. slate Slate is metamorphosed shale.Slate is tougher than shale and it breaks into thin, flat layers.Slate is usually dark gray, but it can also be red colored.efer to Metamorphic Rock Photos for more visual examples of each of these metamorphic rock types. Foliated (Layered) Metamorphic Rocks 1. slate Slate is metamorphosed shale. Slate is tougher than shale and it breaks into thin, flat layers. Slate is usually dark gray, but it can also be red colored.
Metamorphic rocks are any type of preexisting rock which is changed due to intense heat and or pressure. Such heat and pressure occurs when tectonic plates collide, or when magma intrudes into the surrounding bedrock.