Rectangular Refraction Glass Block, 100 x 60 x 18mm Type_Apron Cross wires set inside a

Cross wires set inside a 10mm aperture on a 75mm circular black metal screen

sized for the medium-pitch terminal screws on bench supplies

sized for measuring direction and field strength on the lab bench

3 glass beakers each holds 1000mL with low-form design and spout for large-volume chemistry and laboratory applications

holding a 20mm candle steady for thermal-expansion

Rectangular Refraction Glass Block, 100 x 60 x 18mm Type_Apron Cross wires set inside aPairs 100 by 60mm with 18mm thickness on a glass rectangular refraction block, the larger working face giving longer beam paths for measurable lateral displacement studies.