Digital Vernier Callipers - 150mm, Four-Way Measurement

A set of digital callipers that will not break the bank when you need thirty of them. Made from a carbon fibre composite rather than steel, so they are light in the hand, will not rust, and survive being dropped on a workshop floor rather better than you would expect.

These read out on an LCD instead of a traditional vernier scale, which removes the most common source of student error: misreading the sliding scale. You still get all four classic measurements.

Four measurements, one tool

• Outside diameter using the lower jaws, for shaft and stock sizes
• Inside diameter using the upper jaws, for bores and holes
• Depth using the tail rod
• Step using the back of the slide

Zero the display at any position along the beam. That makes comparative measurement straightforward: set zero on your reference, then read the difference directly instead of subtracting two numbers.

Specifications

• Measuring range: 0 to 150mm / 0 to 6 inch
• Resolution: 0.1mm / 0.01 inch
• Body: carbon fibre composite
• Display: LCD, 40 × 15mm
• Power: one cell battery, included (LR44 / SR44 or CR2032)
• Metric and imperial, switchable

A note for teachers

Resolution here is 0.1mm, not 0.01mm. That is the right call for most classroom work and it is what keeps these affordable as a class set, but it is worth knowing before you build an assessment task around a tighter tolerance. If students need to measure to a hundredth of a millimetre, you want a metal micrometer instead.