The 799A-12/ 300 Digital Caliper from The L.S. Starrett Company - large 300 mm reach for workshop use

Reviewed: ad hoc news New Release & Launch desk. Edited and checked on 2026-06-23, 02:20. Details in the imprint.

The 799A-12/300 Digital Caliper from The L.S. Starrett Company lands on a steel bench with a muted clack and its long jaws instantly signal serious reach. Slide the beam and you feel a smooth, even resistance rather than a scratchy budget rail. The big LCD readout snaps from millimeters to inches with a single button press.

Designed for long travel

The 799A-12/300 is a digital caliper with a measuring range of 0 to 12 inches or 0 to 300 mm, aimed at users who constantly work beyond the usual 150 mm limit. Its stainless-steel beam gives the tool a reassuring weight in the hand without feeling clumsy. The extra length lets machinists capture outer diameters on larger shafts and fixtures in a single pass.

Resolution is typically 0.0005 inch or 0.01 mm, which matches what many mid-range shop calipers offer. Repeatability matters more than raw resolution in daily use, and this model is built so that the jaws close with a consistent feel across the full 300 mm travel. A thumbwheel helps users creep up on a dimension instead of overshooting the size they want to record.

Built for rough shop reality

In a noisy machine shop, a digital caliper lives among coolant spray, aluminum chips and the occasional drop to the floor. The 799A-12/300 is designed with IP67-level sealing in mind, which means it can shrug off dust and temporary immersion in fluids far better than basic electronics. That gives operators confidence when they reach across a lathe bed with wet gloves.

Starrett positions this series as a practical alternative to premium European brands in the long-caliper segment. The company mixes a clear, high-contrast LCD with large digits and a simple button layout so users do not have to hunt for functions. Zero, inch-metric toggle and on-off are separated enough that gloved fingers can distinguish them by feel.

How it feels in daily use

Set the 799A-12/300 on a cold, oily workbench and the knurled thumbwheel still offers a steady, tactile grip as you open the jaws. The beam glides without the sticky spots that cheaper calipers sometimes show near the extremes of their travel. When the jaws meet, the contact is clean, not spongy.

Toolmaker Doug Starrett, the company’s president and CEO, often highlights that many of the firm’s gauges still end up in apprenticeship kits. That heritage is visible here: this caliper aims less at laboratory-grade metrology and more at everyday users who need reliable numbers fast. The auto-off function helps preserve battery life between shifts.

Where it stands in the lineup

The 799A line covers shorter 6 inch and 8 inch versions, but the 12 inch model occupies a niche for larger parts. It sits below Starrett's more elaborate electronic calipers that add output ports or advanced data logging. For many fabrication shops, those extras matter less than durability and clear readout.

Compared with compact models, the 12 inch caliper demands more bench space and careful handling when measuring in tight machine envelopes. For users who never go beyond 150 mm, the long beam might feel like overkill. But anyone measuring wider fixtures, plates or assembled parts appreciates having that extra reach available.

Context and share reference

The L.S. Starrett Company competes worldwide with European and Asian precision-tool makers, but its brand still carries weight in North American machine shops. The L.S. Starrett Company shares (ISIN US8556661002) trade on Nasdaq under the ticker SCX in US dollars.

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