Optically Worked Double Concave Glass Lens, 75mm Diameter, 200mm Focal Length Face Size_38mm Classroom kit for determining relative

Classroom kit for determining relative humidity and dew point using paired dry-bulb and wet-bulb thermometers on a sling handle

Air condenser in borosilicate glass measures 20cm with 19/26 ground joint for high-boiling-point reflux and organic chemistry procedures

and packaged as a single optics kit

Basic 15-slide set pairs common plant and animal tissue preparations for short-unit microscopy coursework in middle school and early high school

open at one end for mercury barometer construction and atmospheric pressure demonstrations

Optically Worked Double Concave Glass Lens, 75mm Diameter, 200mm Focal Length Face Size_38mm Classroom kit for determining relativePairs 75mm of aperture with a 200mm diverging focal length on a double concave glass lens, the gentler curvature softening divergence for clearer virtual image observation in refraction setups.