TOAUTO 2/3 Axis DRO Digital Readout 150mm Linear Scale - Precision 5um

In this review the TOAUTO 2 Axis/3 Axis DRO with a 150mm optical linear scale is evaluated for machine shop use; it is aimed at hobbyists and light industrial users who need a compact, precise digital readout without complex setup. The bottom line is that the unit delivers very good measurement accuracy for its size and price, offering 5 micron resolution and a straightforward DB9 TTL interface that works well on Bridgeport and knee mills, lathes or small EDM machines.

Key Features

• 150mm travel length: The supplied optical linear scale offers a 150mm (6in) travel length which is compact enough for small mills and lathes while covering typical short-travel tasks.
• High precision: The linear sensor claims measurement accuracy to 5 micron (0.005mm), which helps reduce setup and machining errors on fine work.
• DB9 TTL interface: The display accepts a TTL square wave input through a 9-pin DB9 connector and includes a 3m shielded cable for reliable signal transmission to the DRO unit.
• Full mounting kit: The package includes the linear scale, an L type mounting plate, a scale cover and screws so the unit can be installed without sourcing additional hardware.
• Wide supply range: The display operates from AC 80V to 260V at 50-60Hz and ships with a US plug, making it compatible with common workshop mains voltages.

Who It's For

The TOAUTO DRO suits hobby machinists, small toolroom operators and owners of Bridgeport or knee milling machines who need a compact, accurate readout for short travel tasks. Its 150mm scale is well matched to setups where a full-length scale would be unnecessary or bulky.

It is less appropriate for large industrial mills or applications that require long travel scales; customers needing longer cable runs should confirm pricing with the seller. Those who require an integrated factory-calibrated system with extensive certification may want a different commercial DRO solution.

Pros & Cons

Pros

• Accurate 5um resolution provides fine positional feedback for precision work.
• DB9 TTL interface with 3m shielded cable simplifies connection to many displays and controllers.
• Complete mounting kit and scale cover reduce installation time and the need for extra parts.
• Wide AC supply range allows use on common workshop circuits.

Cons

• Travel length is fixed at 150mm for this listing, so larger setups require ordering longer scales in different increments.
• Some customers reported mixed impressions of build quality, so careful inspection at installation is advised.

Specifications

Brand	TOAUTO
Travel length	150mm (6in)
Measurement accuracy	5 micron (0.005mm)
Interface	TTL square wave via DB9 (9-pin)
Cable	Default 3m multilayer shielded cable
Power	AC 80V~260V, 50~60Hz (US plug)

Our Verdict

The TOAUTO 150mm DRO is a practical, good-value option for hobbyists and small shops needing precise positional feedback on short-travel machines. Its 5um accuracy, full mounting kit and DB9 interface make it easy to fit on common mills and lathes, though buyers should confirm scale length and inspect fitment for their specific machine before purchase.

Frequently Asked Questions

Does the kit include mounting hardware?
Yes, the package includes the linear scale, an L type mounting plate, a scale cover and screws so basic installation hardware is provided.

What cable length is supplied?
A 3m multilayer shielded signal cable with DB9 connector is included as the default; contact the seller if a longer cable is needed for your setup.

What machines is this suited for?
It is intended for small mills, Bridgeport/knee mills, lathes and similar machines where a 150mm travel DRO meets your measurement range.