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Products > DROs > DRO Packages     All DRO Pros products

Digital Position Readout, 3-Axis 3811  (Discontinued)

Digital Position Readout, 3-Axis
Part Number: 3811  (Discontinued)
Weight: 40.0 lb

Price: $799.00

This product is currently backordered.

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  • 5 microns (0.0002") resolution glass scales of your choice up to 40.3" of travel
  • Easy to read color LCD display
  • Kit prices includes scale sizes up to 1000mm
  • Sealed to protect from dust, fluids or fumes
  • 3 Year USA warranty


The ES-12C has been completely redesigned and is the latest from Easson. The Color LCD display is extremely easy to read, and the screen has over a dozen different built in, user selectable color schemes. It graphically shows the function you've programmed in real time, meaning it draws exactly what you programmed, and can see the cut before you cut it! Resolution is industry standard 5 microns (.0002"). The enclosure is sealed to protect the electronic circuitry from dust, fluids or fumes. Basic and special functions are accessed via the front tactile keypad. Kits include everything you need - a display head, power supply, mounting arm, power cord, operators manual, standard length scales of your choice, shields, mounting hardware, a handy collet holder, brackets, etc. Kit prices includes scale sizes up to 1000mm at no extra charge.

110/220V Operation

Chris' Tips

Chris Chris' Tips
You have to tell us which scales you need. This is always based on your machine’s travel.

Here is how to measure your machine’s travel: With the machine off, position the machine to one end of its travel. With a grease pencil, make a mark across where the moving and stationary surfaces meet. The line should be half on the moving part and half on the stationary part. Next, move your machine to the opposite end of its travel, and then simply measure the distance between the marks.

Now, add ¾" to the distance you measured and convert it to mm by multiplying by 25.4. (Or, measure the distance in mm, and add 20 mm.) Round up to the next even 50 mm and that’s the scale you need.

Let’s look at an example:

Measured distance


143 mm

Add ¾" (20 mm) margin


20 mm

Required scale travel


163 mm

Convert to mm

162 mm

Next scale size

200 mm

200 mm

Now repeat this procedure for the other axes on your machine.

Here are the scales needed for a couple machines:
LMS HiTorque Mini Mill:  X=350,  Y=150,  Z=300
LMS HiTorque Bench Mill: X=450,  Y=200,  Z=350
Most Mini Mills:  X=300,  Y=150,  Z=250

Scale-Based DRO Packages are designed to mount on any machine within the range of the scales. They all come with 'universal' mounting brackets. These mounting brackets are probably all you need to mount the DRO on large machines. On smaller machines (including mini lathes and mini mills) you will probably need to make some mounting brackets. Note that the Bluetooth DRO packages, except the universal models, come with all the brackets required for the machines they support. All scale-based DRO installations require drilling and tapping a number of holes in the machine.

The biggest challenge is usually the cross slide on small lathes and the X-axis on small mills. On small lathes, the answer is sometimes to mount the DRO scale hanging in space behind the cross slide. On small mills, the smaller cross section of the Shooting Star and the DRO Pros magnetic scales can make it significantly easier to mount the X-axis scale behind the table without restricting the table travel. Glass scales are a challenge to mount on small machines.


This DRO kit features the following:
Clear Zero: Sets the current position to zero. Allows you to specify any desired point as the "0" reference point.
Inch/Metric Display: Allows you to choose between inch and metric display.
Direct Entry: Allows you to manually input the desired dimension and coordinate.
Result Transfer: A point value computed from the calculator feature can be entered and found.
ABS/INC (Absolute/Incremental): Allows the operator to switch between absolute and incremental display. Absolute display references the work piece zero coordinate you define. Incremental display references any arbitrary coordinate/position without losing your designated zero point.
Center Find Function: Automatically calculates the center of the work piece after the edges are located.
199 Reference or Sub Datum Memory (SDM) Points: Ideal for repetitive machining, lets you create exact copies of your original work piece. Enter points as you move to them on your work piece or enter them in a list format.
Power Off Memory (Reference Datum Memory): Allows you to store the work piece zero position in memory. If the machine is turned off at night or there is a power failure, the zero reference point can be recovered without having to re-establish the work piece zero point.
Linear Hole Tool Positioning: Provides a linear hole positioning function for drilling holes a fixed distance apart, at any angle.
Incline Tool Position: Allows you to accurately position the work piece at an angle on the work table. Also allows an incline function for machining parts positioned on an inclined surface.
Bolt Hole Circle (aka PCD or Pitch Circle Diameter): Using the bolt hole circle function, you can drill holes in a circle from a designated center point.
Arc Machining: Allows you to make radius and arc cuts.
Calculator: Built-in calculator function, which provides mathematical and trigonometric functions such as: add, subtract, multiply, divide, sine, cosine, tangent, square root, etc.
Parameters Setup: Enables you to reverse the direction a scale reads, also allows the operator to perform a memory check.


Repeatability 2 μm, 0.002 mm, 0.0001"
Resolution 5 μm, 0.005 mm, 0.0002"
Specified Accuracy 6 μm, 0.006 mm, 0.0002" / 50 mm travel
Accuracy / Foot 0.0014" (0.036 mm)
Accuracy / 100 mm 0.0005" (0.012 mm)
Scales Cut to Length by User No
Scale Technology Glass
Scale Protection Coolant & dust resistant
Voltage 120-240 V
Clear to Zero Yes
Direct Entry of Position Yes
Inch/mm Display Yes
Power Off Memory Yes
Reversible Count Direction Yes
Find Center Yes
Bolt Circles Yes
Bolt Lines Yes
Preset Points No
Tool Offsets No
Radius/Diameter Yes
Incremental/Absolute Yes
Calculator Yes
Arc machining Yes
Linear Error Compensation Yes
Made in China
Warranty 3 years
Phone Tech Support Free



This product works with the following mills. (If your machine is not on this list, check with us before ordering.)

  •   Bolton XJ-9510 Mill/Drill
  •   Clarke CMD300 Milling Drilling Machine
  •   Grizzly G8689 Mini Milling Machine
  •   Hare & Forbes HM-10 Mill/Drill
  •   Princess Auto 8507667 Powerfist Mini Mill
  •   SIEG X2-MT3 Mini Mill
  •   Micro-Mark 82573 MicroLux Milling Machine
  •   BusyBee CX605 Craftex Mini Mill
  •   Cummins (Tools Now) 7877 Mini Mill
  •   Eastwood 32498 Mini Mill
  •   Harbor Freight 44991 Central Machinery Mill/Drill
  •   Homier 03947 Speedway Mini Mill
  •   Northern Tool 49657 KLUTCH Mini Mill
  •   Penn Tool Co XJ-9510-1 Precise Mini Mill
  •   SIEG X2-R8 Mini Mill
  •   Travers Tools OT2213 OTMT Mini Mill
  •   SIEG X2P Mini Mill
  • 4962 SIEG Mini Mill
  •   SIEG X2D Mini Mill
  •   SIEG X2L Mini Mill
  •   WEN 33013 WEN Mini Mill
  •   SIEG X2LF Mini Mill
  •   BusyBee CX612 Craftex Mini Mill
  •   SIEG SX2 Mini Mill
  •   Micro-Mark 84630 MicroLux Mini Mill
  • 3900 HiTorque Mini Mill
  •   SIEG SX2L Mini Mill
  • 4190 HiTorque Mini Mill
  • 3990 HiTorque Mini Mill
  • 3960 HiTorque Mini Mill
  •   SIEG SX2LF Mini Mill
  •   Grizzly G0781 Mill/Drill
  •   SIEG X2.7 Bench Mill
  •   SIEG X2.7L Bench Mill
  •   WEN 33075 WEN Bench Mill
  • 6500 HiTorque Bench Mill
  • 5500 HiTorque Bench Mill
  •   SIEG SX2.7 Bench Mill
  • 5550 HiTorque Bench Mill
  • 6550 HiTorque Bench Mill
  •   Grizzly G0463 Mill/Drill
  •   Harbor Freight 93885 Central Machinery Mill/Drill
  •   SIEG X3 Small Mill
  •   Woodstock International M1110 Shop Fox Small Mill
  •   BusyBee CX611 Craftex Small Mill
  •   Grizzly G0619 Mill/Drill
  •   SIEG SX3 Small Mill
  •   Travers Tools OT2225SX3 OTMT Small Mill
  •   Grizzly G0759 Mill/Drill With Stand
  •   Grizzly G0704 Mill/Drill With Stand
  •   Grizzly G3102 Vertical Mill
  •   Grizzly G3103 Vertical Mill
  •   Harbor Freight 42976 Central Machinery Mill/Drill
  •   SIEG X3.5 Large Bench Mill
  • 6700 HiTorque Large Bench Mill
  • 6750 HiTorque Large Bench Mill
  •   Grizzly G0720R Bench Mill
  •   Grizzly G0722 Bench Mill
  •   Grizzly G0720 Bench Mill
  •   SIEG SX4 Bench Mill
  •   Harbor Freight 33686 Central Machinery Small Mill
  •   Rong Fu RF-xx Milling & Drilling Machine
  •   BusyBee CX705 Craftex Lathe Mill Combo
  •   Grizzly G0516 Lathe Mill Combo
  •   SIEG M6 Multi-purpose Machine


This item ships directly from our supplier in California to you. It might be a day or two longer before it ships, and you will receive it in a separate package from other items on your order. You might receive this item a few days before or a few days after you receive items shipped from our warehouse.


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