acu-rite dro 300 digital readoutIf you are looking for Acu-Rite DRO 203 digital readouts (one, two or three axes) for sale or replacement parts then you are welcome to contact us at (972) 822-0478 or contact us with your questions.  It is programmable for 3 or 4 axes.

The ACU-RITE DRO 300 is a versatile digital readout designed primarily for milling, drilling, boring, and lathe machines with up to four axes. A separate I/O unit provides switching input/outputs for simple tasks in automation.


Thanks to its splash-proof full-travel keyboard, the DRO 300 is exceptionally well-suited for use in a workshop. It supports all operations with intuitive interactive menus on its large, easy-to-read color flat-panel display.


The DRO 300 has the same functions as the DRO 203. In addition, the DRO 300 offers a connection for the KT 130 edge finder. This allows you to define presets and datums with speed and precision. The DRO 300 digital readout supports you with special probing functions.

In addition, the DRO 300 is programmable, which makes it ideal for small-batch production on conventional machine tools. The DRO 300 allows you to store up to eight programs, each with up to 250 working steps.

Programs are created by either keying them in step by step or by generating them using actual position capture (teach-in programming).

Data interfaces

A USB port enables the  writing and reading out of data and files.

The most complete digital readout system in the machine tool marketplace, the DRO300 has full part program capability, 99 tool offsets and multiple DRO displays along with standard input/output capability and edgefinder probe support all on an easy to read 7-inch color display. Designed and manufactured in the USA, ACU-RITE readouts are the first choice of machine tool builders and users alike.

Dynamic zoom

The currently moving axis can be geographically highlighted. In “dynamic zoom” mode, the position value is zoomed to its maximum size depending on the number of digits. This greatly improves legibility—especially from a great distance.

Installation guide

When you switch on the digital readout for the first time, the DRO300 supports you with an installation guide. You are led step by step through the most important settings until the device is ready for operation.

Day/night switching

Depending on the ambient-light conditions at the machine, you can switch the screen of the DRO300 to a light or dark background.

Milling Specific Features

    • Bolthole pattern calculations with graphics (full and partial circles/linear patterns)
    • Centerline calculation enables you to establish workpiece zero and midpoints
    • Edge finder input
    • I/O (option)

Turning Specific Features

    • Lock axis feature
    • Instant radius/diameter conversion
    • Taper Calculator
  • CSS (option)


Application Milling, turning, grinding, boring and general purpose
Axes 2, 3, and 4 from A to Z and Z0
Encoder Inputs TTL
Display Step
  • Adjustable, max. 7 digits
  • Linear axis: 1 mm to 0.0001 mm
  • Angular axis: 1° to 0.001° (00° 00′ 01”)
  • 3 Axes (DRO303) or 4 Axes (DRO404)
  • 7-inch color wide screen (15:9)\
  • Resolution 800 x 480 pixels for Position Values, Dialog Messages, Input and Graphic Functions
Status Display
  • Tool
  • Reference point
  • Operating function
  • Feed rate
  • mm/inch
  • Stopwatch
Axis Display Standard
Common Functions
  • Multiple Display Views – DRO1, DRO2 & DRO3
  • Program Storage
  • Advanced Skew Compensation
  • Job Clock / Stop Watch
  • Feed Rate Display
  • Multiple Language Support
  • Absolute/Incremental
  • Near-Zero Warning with Graphics
  • Help function
  • 99 Tool Offsets/Diameter
  • Preset and Zero Reset
  • 4 Function Calculator/Trig Calculator
  • Instant Inch/mm Conversion
  • Position-Trac™ Home Reference System
  • Linear/non-linear compensation up to ±9,999 ppm
Turning Specific Functions
  • Lock Axis Feature establish tool offsets with the tool under load, resulting in reduced tool deflection
  • Instant radius / diameter conversion
  • Taper calculator, Vectoring
  • INCLUDES Thread Assist simplify cutting metric threads on lathes with English leadscrews
Milling Specific Functions
  • Bolt-hole Pattern Calculations with Graphics (full and partial circles/linear patterns)
  • Centerline Calculation establish workpiece zero and midpoints
  • Edge finder/touch probe input
Cycles Oblique line, circular arcs; only for milling, drilling, boring:circular and linear hole patterns
Error Compensation
  • Axis error: Linear and nonlinear over up to 200 points
  • Backlash compensation: for compensation of reversal error
Data Interface USB 2.0 type C

  • For Output of Parameters to a USB Stick or PC
  • For Input of Parameters, Remote Control of Keys and Commands
Switching I/O
  • Input for Edge Finder (with switching signal or contact triggering)
  • Further input/outputs over the IOB 49 external input/output unit
  • CSS (Constant surface speed), I/O (Input/Output)
  • Multiple Scale Coupling Box
  • Electronic Edgefinder
  • Single-Position Tilting Base, Multiposition Holder, Mounting Frame, Protective Cover
  • IB2X (allows input of 2 additional axis)
Electrical Requirements AC 100 V to 240 V (±10 %), 50 Hz to 60 Hz (±5 %), ≤ 33 W
Operating Temperature 0° to 45º C (32º to 113º F)
Protection EN60529 IP 40, Front Panel IP 54
Weight ~1.9 kg
Acu-Rite DRO 300 digital readout for 3 or 4 axes
Brand: Acu-Rite
Manufacturer: Acu-Rite
Model: DRO 300