Camera Accessories
Diameter 50mm 80mm 112mm 120mm 130mm 150mm Glass Fresnel Thread Lens High Borosilicate Stage Light Spotlight Lenses(D112 F110)
Microscopes Equipment Feature: 1) High temperature resistant . 2) High Borosilicate Glass Material. 3) The maximum temperature of the center point is 480 degrees Celsius. 4) The recommended operating temperature should not exceed 500 degrees Celsius.
https://www.bizrate.co.uk/cameraaccessories/diameter-50mm-80mm-112mm-120mm-oid37179542255.html