Concave Glass Mirror, 75mm Diameter, 100mm Focal Length Metal Labware_Metal Labware Sets designed to hold visible iron-filing

designed to hold visible iron-filing field lines and support side-by-side magnet-strength comparisons in mechanics labs

supplied with weights and set up to minimize parallax error during spring-extension measurements

Three-in-one weather station on a 5

this decade box substitutes for fixed resistors across a broad range of circuit work

Concave Glass Mirror, 75mm Diameter, 100mm Focal Length Metal Labware_Metal Labware Sets designed to hold visible iron-filingPairs 75mm of aperture with a 100mm focal length on a concave glass surface, the f 1. 3 ratio giving fast convergence with moderate working distance for image formation work.