Sliding Caliper — 4 Inch (100 mm) Brass, Notched Jaws for Gem, Bead & Watch Work

A brass sliding caliper for the measurements that matter around delicate work: ring and bezel inside diameters, watch components, gem and bead sizes. The notched jaws are shaped specifically for inside-diameter readings, and because the body is solid brass it is non-magnetic — safe around watch movements — and will not scratch what it touches.

Dual metric and imperial scales are clearly etched along the 100 mm / 4 inch body, and a knurled brass thumbscrew locks the sliding jaw so a measurement can be carried across the workshop without drifting. A simple, robust gauge with no battery to fail at the wrong moment.

• Solid brass construction prevents magnetising watch movements or scratching delicate workpieces.
• Notched jaws are specifically shaped for taking accurate inside-diameter measurements.
• Dual metric and imperial scales are clearly etched onto the body for easy reading.
• A knurled brass thumbscrew locks the sliding jaw securely for transferring measurements.
• Provides a full measuring range of 100mm / 4 inches for common bench tasks.

Who it's for

A practical measuring tool for UK bench jewellers, horologists, and clockmakers. Also favoured by model makers and engineers who require a non-marring, non-magnetic caliper for working with delicate materials and components.

Specifications

• Material: Solid Brass
• Measuring Range: 100mm / 4 inches
• Scales: Metric (mm) and Imperial (inches)

Free UK delivery from £30 · Same-day dispatch target for orders before 2pm Mon–Fri · 30-day returns