The ACU-RITE 300 series is a versatile programmable digital readout for 2-, 3- or 4-axes display in turning and milling modes. it is designed primarily for milling machines, drilling and boring machines and lathes with up to 4 axes.

The easy-to-use readout contains many new and advanced features such as multiple-language display and multi-programme storage.

This robust unit also features a splash-proof full travel keypad for workshop use.


The 300S is equipped with a 5.7” LCD monitor that replaces the cathode-ray monitor of the VRO300. The “soft keys” are used for a variety of functions, such as operation and parameterisation. The monitor is also used in the 200S series. The 300S provides all the functions of a programmable counter, such as the creation, editing, storing and running of programmes. Multiple programmes with different names can be saved in the programme list.

Mechanical compatibility

The 300S can be installed on all counter mounting bases as well as in the existing mounting frames.

Electrical connection

All digital ACU-RITE scales with D9 connectors can be connected directly to the 300S.


Application Milling, drilling, turning
Axes 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”)
Display 5.7” colour flat-panel display for position values, dialogs and inputs, and soft keys
Status display Tool, reference point, operating function, feed rate, ABS/INC, mm/inch, stopwatch
Axis display Switchable between DRO1 and DRO2
  • 10 datums
  • 99 tools
  • REF reference-mark evaluation for distance-coded or single reference marks
  • Distance-to-go mode
  • Axis coupling
  • Scaling factor
  • mm/inch switching
  • Absolute-incremental display
  • On-screen help and operating instructions
  • Graphic positioning support (Near Zero warning)
  • Pocket calculator
For turning
  • Taper calculator
  • Radius/diameter switching
  • Freezing the tool position for back-off
  • Vectoring: X/Y display of the traverse path with inclined top slide
  • Sum displays for Z and ZO (axis coupling)
For milling/drilling/boring
  • Calculation of positions for hole patterns (circular patterns and linear patterns)
  • Tool radius and tool length compensation
  • Probing functions for reference-point acquisition with KT edge finder: “Edge”, “Centerline” and
    “Circle center”
  • Oblique line, circular arc
  • Linear hole patterns, bolt hole circles
Programming 8 programs with up to 250 steps
Error compensation
  • Axis error: Linear and segmented over up to 200 points
  • Backlash compensation: for compensation of reversal error
Data interface RS-232-C/V.24 300 to 115 200 baud
Switching I/O
  • Input for edge finder (with switching signal or contact triggering)
  • Further input/outputs over the IOB 49 external input/output unit
Accessories Mounting arms, mounting frame, KT 130 edge finder (for milling)
Power connection 100 V AC to 240 V AC (–15 % to +10 %), 47 Hz to 63 Hz; 30 W
Operating temperature 0° C to 45° C
Protection(IEC 60 529) IP 40 (IP 54 front panel)
Weight 2.6 kg


Please note that only the products that are listed on this website are available for purchase in the United Kingdom.

Product Brochure

Product Manual