Digital Readout Systems (DRO kits)


ZS Instruments DR300/DR400 series of Digital Readout Displays and Linear Glass Scales are proudly designed, manufactured, and assembled in the USA. The DR series of Digital Readouts provides up to 4-axis position readouts for milling machines, lathes, horizontal boring mills, surface grinders, OD grinders, and other manufacturing machinery. Through advanced functions such as probing, bolt hole patterns, multi-plane radius/incline milling, and directional tool compensation, our DRO systems simplify even the most complex machining operations.

Quality and Reliability

ZS Instruments’ manufacturing and Quality Control processes ensure that our products not just meet, but exceed customers’ expectations. We strongly believe that industrial electronics should last a lifetime like it used to. That’s why all of ZS products conform to stringent IPC-A-610 class III high-reliability requirements for design, assembly, and inspection of electronics.

Our Circuits Boards are made very unique in industry – at first they are fully defluxed to remove any harmful corrosive residues, followed by receiving a layer of Conformal Coating, practice typically used for Military & Aerospace devices. Taking this extra step significantly improves resistant to metal dust, moisture, aggressive vapors, and fungus.

Advanced Optical Technology

Unlike their magnetic and/or inductive counterparts, glass scales and rotary encoders are not compromised in the presence of metal dust or magnetic fields. Only optical technology can provide native 5µm (0.0002’’) resolution without relying on approximation and ensure consistent levels of high precision over their entire lifespan.

We own a portfolio of several patents both issued and pending, and incorporate the most innovative solutions into our Encoders and Digital Readouts, making them some of the most ergonomic, compact, reliable, and power efficient on the market.

User Centered Interface

The DR 400 series of operator consoles brings an intuitive graphical interface and a modern ergonomic design. DR300 consoles are well known for their simplicity and the time-tested ruggedness of 7 segment LED display, while our auxiliary LCD provides interactive prompts for enhanced user experience.

Don't compromise quality for a price

ZS instruments is an innovative high tech company founded at Purdue Research Park West Lafayette Indiana. We offers industry leading performance at price up to 30% lower than competition. Ran a forklift into your scale or wound the cable on a lathe chuck? Not a problem, our replacement scales can be also purchased directly and at a fair price! Learn More…

Available with 2 styles of Mounting Arms

Mill Mounting Arm Lathe Mounting Arm

Straight Arm allows for easy mount to the Ram of the Mill, while L-shaped design attaches to the lathe gearbox and brings DRO display closer to the operator.

Essential Features

All ZS Instruments DRO displays always have either 3 or 4 axis capabilities, regardless of the number of scales purchased with the kit. The number of displayed axes can be easily changed in the settings menu between 1, 2, 3 or 4 (DR404 only).

Our DRO consoles make interchanging between machines easy. All of ZS instruments displays are UNIVERSAL, allowing the user to switch between Mill and Lathe modes at any time.

Milling, Boring, Drilling:
  • 1/2 Center Find
  • Bolt Hole Circles, Linear Hole Patterns and Hole Arrays
  • Radius & Incline machining in any plane: XY, XZ or YZ
  • Tool diameter and length compensation with 99 tool library
  • Edge, Centerline, and Circle Center probing with tool, manual edge finder or touch probe (DR400 series only)
  • 4th encoder input with axis coupling mode (DR400 series only)
  • Radius/Diameter mode
  • Taper measurement
  • Tool offsets with 99 tool library
  • Full vector axis summing with compound angle option
  • Feedrate display in either mm/s or inches per minute (ipm)
  • 99 programmable sub-datum points
  • Selectable number of decimal points
  • Calculator with sin/cos functions
  • Power independent memory
  • Power loss zero restore (reference marks evaluation)
  • LCD Backlight On/Off (DR300)
  • Fully Dimmable LCD with user selectable Sleep timer (DR400)
  • Sleep mode
  • USB Firmware upgrade
  • RS232 Position Data Output (DR400 series only)
  • Programmable Foot Pedal and External Pulse inputs (DR400 series only)
  • Universal 100-240V power