Balance Spring

Vernier Calipers Digital • Hardened Stainless Steel construction, bright LCD display. • Easy push button Metric English conversion. • Operates on one 1.5V silver oxide battery (included). • Automatic shut off. • 0-150mm x 0.01 mm / 6 inches x 0.0005 In. • Comes complete with foam lined sturdy case, and instructions.

Spherometer Spherometer for the accurate measurement of the radius of curvature of spherical lenses. Made of brass with a vertical scale of 10-0-10mm. A micrometre scale with 100 divisions

Screw Gauge Micrometers • Stainless Steel screw (rod) accurately machined. • Brass body, dull nickel plated finish. • 25 mm x 1 mm pitch. • This item is sold individually.

Spherometer Demonstration Model • 140 mm diameter (approx.) dials head. • Made of aluminum, baked stove enamel finish