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High-quality goggles with adjustable nylon strap and ergonomic comfort. Can be worn over prescription glasses, and compatible with half-mask respirator. Sealed frames Anti-scratch anti-fog coating Optical class: • Use: molten metal hot solids EN166 4 9

Set of gratings 96, 300 and 600 lines/mm mounted on single slide with three 16 x 19 mm apertures. Dimensions 90 x 30 mm.

The balancing beam kit contains 5 sets of pre-drilled wooden beams with a central pivot and brass hooks to slot into the holes. The brass hooks are used to support slotted masses (not included) and the pivot is clamped into a retort boss head for support. Contents: 5 each of balance beams and pivots plus 10 brass hooks; enough for 5 groups or individual students.