Glass Water Still Material_Polyethylene Nickel-plated T-pins provide secure specimen

Nickel-plated T-pins provide secure specimen pinning with broad heads for stable dissection board mounting in biology laboratories

a 75mm-aperture double-concave glass lens at 100mm focal length spreads light through optically worked surfaces and ground polished edges

Pairs a 75 by 50mm face with a thicker 18mm body on a rectangular glass refraction block

sized to read mid-stack battery voltages between the 5V and 15V meters in the line

and cylinders during glassware care

Glass Water Still Material_Polyethylene Nickel-plated T-pins provide secure specimenAll glass water still producing distilled water for laboratory use through a contamination free path that eliminates metallic leaching from internal surfaces.