Sizing a Mill
Sizing a Lathe
#1 Advantage of
Magnetic Scales

#2 Advantage of
Magnetic Scales
Installing a Mill
Kit - Part 1 of 4
Installing a Mill
Kit - Part 2 of 4
Installing a Mill
Kit - Part 3 of 4
Installing a Mill
Kit - Part 4 of 4
Installing a Lathe
Kit - Part 1 of 4
Installing a Lathe
Kit - Part 2 of 4
Installing a Lathe
Kit - Part 3 of 4
Installing a Lathe
Kit - Part 4 of 4
EL400 Display Overview
EL700 Display
Part 1 of 4
EL700 Display
Part 2 of 4
EL700 Display
Part 3 of 4
DRO PROS Intro Video
ARC Machining
Incline Tool Position
ES10 Overview
Sub Datum Memory
Line Hole Position
Bolt Hole Circle
Parameters Setup
Choosing Your Scales
Power Off Memory
Center Find Function
Changing Scale Direction



Our kit and part prices always beat Newall Acurite Sargon & Fagor!

Toll Free Order Line & Tech Help - Call now 1-707-452-8434

We speak English - We answer our phones - Lifetime Warranty on magnetic kits!

Magnetic Scales cannot be broken - Coolant & Dust Proof - Cut to length



DRO KIT Scale Sizing - How do I determine the right size scales for my machine?


Click HERE to download a copy of this article


There are a couple of ways to determine which size scales you need.


The best way is to physically measure the travel of your machine as shown in the photos below.


Again, while there are several alternative ways to measure travel, the safest way to protect your equipment is to physically measure the travel of your machine. If you are replacing an older DRO kit, you may have considered measuring the existing scale lengths and 'match' them to the scales we sell. Unfortunately, there are a couple of reasons this might not work. First off, when your old DRO kit was installed, the odds are scales were only available in 6" increments, possibly even longer (at DRO PROS we carry scales in 2" increments). Second, the difference between actual travel and physical length differs between manufacturers.


The other alternative is to rely on the "spec sheet" or owners manual to obtain machine travels. Quite often a manufacturer will use the same spec sheet for different models. While most of the time this will work as second best to measuring, again, there are many instances where the owners manual is not updated or does not correctly reflect the true travel of the machine.


Most likely, without actually measuring your machines travel, there's a pretty good chance you might not get the right scales. We recommend taking the time to measure to protect your investment.


The last 'hurdle' to measuring a machines travel is whether or not it's equipped with a power feed. Most milling machines with a power feed will have the effective travel reduced by 5-6" with a power feed installed. DRO PROS recommends to outfit your machine with a scale that will cover the full travel with the power feed removed. That's because if for some reason in the future the power feed breaks, or is uninstalled, then full travel of the mill will not break the scale.



Measuring a Lathe


Lathemaster Benchtop lathe ready for a DRO!




First, position your carriage towards the headstock until it 'bumps up' against the headstock:


First, slide the carriage towards the headstock




Next, make a mark (ours is in red) on the bed just to the left of the apron:


Then make a mark to the left of the apron


Make a mark to the left of the apron like this




Reposition the carriage all the way to the tailstock end:


Now move the carriage to the tailstock end




You can see below where the threading dial housing is now flush against the leadscrew hangar bearing:


 Make sure you move the carriage all the way to the end




And from the front, this is what it looks like:


The distance between the marks is the Z axis, or carriage travel




Measure between the previously made red mark and the edge of the carriage apron:


Measure between the marks to get the Z travel


This distance represents your total carriage travel. As in the case with most scales, we recommend allowing ~ 1/2 inch clearance on either end of the scale to arrive at your total required scale travel.




Next, let's take a look at the cross slide:


Close-up of a typical cross slide




Notice the gap between the back of the cross slide handwheel dial housing and the cross slide. This indicates the cross slide is not in the full forward position:


Start by moving the cross slide all the way to the front




Move the cross slide to the full most forward position:


Start by moving the cross slide all the way to the front




Note the cross slide handwheel dial housing is now flush against the cross slide:


Note how the cross slide is all the way to the front




Make a mark on the cross slide (we used red). Specifically where is not important:


Make a mark on the cross slide...




Next, make a corresponding mark on the saddle (we used green), opposite the mark on the cross slide:


...and on the carriage below it




Here is a close-up:


Close-up of the cross slide and carriage marks




Reposition the cross slide to the rear-most position:


Now move the cross slide all the way to the rear




Notice how the marks 'split':


Cross slide in the rearmost position




The distance between the marks represents the movement, or travel, of your cross slide:


The distance betweeen the marks is the travel of the cross slide


Most of the time we recommend allowing ~ 1/2 inch clearance on either end of the scale to arrive at your total required scale travel. But the cross slide is unique in that there's typically not a lot of 'extra' room to keep the scale from 'hanging off' the end. So oftentimes when we talk to customers we'll recommend a scale with less than the typical 1/2" clearance. How much 'extra' scale do you need? Depends on your experience and what you feel comfortable with...


Of course you can always call and we'll talk you through the decision process. Call our techs now at (877) 628-6028 - they're glad to help!


Glass Scale Kits

At DRO PROS, we only sell true five bearing scales with our glass scale kits, and with over 70 different size scales to choose from, we fit your machine right! For .0002" resolution scales up to 39.3" in capacity (models 100mm - 1000mm), the scales are included in the price of the kit and there is no surcharge. Simply tell us what size scale you'd like and we'll send the correct length scale. For scales greater than 39" capacity (our oversize scales), there is a small surcharge based on length when purchased with a kit.


Please refer to the chart below for more details:

Choose from the following scales:
Scale Travel
Scale Length
5 micron
0.0002" / .005mm
1 micron
0.00005" / .001mm
5 micron
0.0002" / .005mm
1 micron
0.00005" / .001mm
Model Cost w/kit Cost Alone Model Cost w/kit Cost Alone Model Cost w/kit Cost Alone Model Cost w/kit Cost Alone
100mm 100 / 3.9" 125 / 4.9" 9.9" GS10-100 Free $133 GS11-100 + $50 $183 GS30-100 Free $133 GS31-100 + $50 $183
150mm 150 / 5.9" 175 / 6.9" 11.9" GS10-150 Free $133 GS11-150 + $50 $183 GS30-150 Free $133 GS31-150 + $50 $183
200mm 200 / 7.8" 225 / 8.8" 13.8" GS10-200 Free $138 GS11-200 + $50 $188 GS30-200 Free $138 GS31-200 + $50 $188
250mm 250 / 9.8" 275 / 10.8" 15.8" GS10-250 Free $143 GS11-250 + $50 $193 GS30-250 Free $143 GS31-250 + $50 $193
300mm 300 / 11.8" 325 / 12.8" 17.8" GS10-300 Free $147 GS11-300 + $50 $197 GS30-300 Free $147 GS31-300 + $50 $197
350mm 350 / 13.7" 375 / 14.7" 19.7" GS10-350 Free $150 GS11-350 + $50 $200 GS30-350 Free $150 GS31-350 + $50 $200
400mm 400 / 15.7" 425 / 16.7" 21.7" GS10-400 Free $156 GS11-400 + $50 $206 GS30-400 Free $156 GS31-400 + $50 $206
450mm 450 / 17.7" 475 / 18.7" 23.7" GS10-450 Free $160 GS11-450 + $50 $210 GS30-450 Free $160 GS31-450 + $50 $210
500mm 500 / 19.6" 525 / 20.6" 25.6" GS10-500 Free $166 GS11-500 + $50 $216 GS30-500 Free $166 GS31-500 + $50 $216
550mm 550 / 21.6" 575 / 22.6" 27.6" GS10-550 Free $169 GS11-550 + $50 $219            
600mm 600 / 23.6" 625 / 24.6" 29.6" GS10-600 Free $179 GS11-600 + $50 $229            
650mm 650 / 25.5" 675 / 26.5" 31.5" GS10-650 Free $182 GS11-650 + $50 $232            
700mm 700 / 27.5" 725 / 28.5" 33.5" GS10-700 Free $187 GS11-700 + $50 $237            
750mm 750 / 29.5" 775 / 30.5" 35.5" GS10-750 Free $191 GS11-750 + $50 $241            
800mm 800 / 31.0" 825 / 32.0" 37.0" GS10-800 Free $197 GS11-800 + $50 $247            
850mm 850 / 33.4" 875 / 34.4" 39.4" GS10-850 Free $206 GS11-850 + $50 $256            
900mm 900 / 35.4" 925 / 36.4" 41.4" GS10-900 Free $226 GS11-900 + $50 $276            
950mm 950 / 37.4" 975 / 38.4" 43.4" GS10-950 Free $229 GS11-950 + $50 $279            
1000mm 1000 / 39.3" 1025 / 40.3" 45.3" GS10-1000 Free $292 GS11-1000 + $50 $342            
1100mm 1100 / 43.3" 1125 / 44.3" 49.3" GS10-1100 + $50 $340                  
1200mm 1200 / 47.2" 1225 / 48.2" 53.2" GS10-1200 + $50 $404                  


Click HERE to download a DRO PROS Scale Chart




Why does DRO PROS post their digital readout part prices online when other companies don't?

That's because if you were to find out what other companies are going to charge you for parts

when you need them, you might not buy their digital readout kit in the first place!

At DRO PROS, we're proud to show off our low part prices. 




Why should you buy from DRO PROS?

We speak English - We answer our phones - Same day shipping

Veteran owned, Veteran managed - and proud of it!


Our goal is to make customers for life. We feel that, in the long run, treating customers right will yield much more than simply "going for the sale". In accordance with that, we have attempted to pass on some ideas to help you, the customer, in completing your purchase decision:


Price. Probably the most talked about factor when buying a digital readout. Price can also be the most misleading, and perhaps worst way, to judge a digital readout kit. We've all heard the old adage, "You get what you pay for." Before the internet, it was true, price did generally correlate directly to value. But that was yesterdays economy. All resellers obtained their goods the same way, and therefore incurred the same costs. In today's economy, the market has changed drastically. At DRO PROS, we import and sell directly to you. Unlike our competitors, we do not have Western and Eastern sales divisions and multi layers of management to support. One location, one cost, and the savings get passed on to you!


Intuitiveness or "Ease of Use". Probably the most important, and hardest to determine factor when buying a readout. Think in terms of after the sale. Even if you get an absolute 'rock star' bottom line price that would make William Shatner proud, if the digital readout is not user friendly, you still didn't get a 'deal'. The whole point of getting a digital readout is to make your work easier and more enjoyable. If the digital readout is poorly designed, too complicated, if the display isn't bright enough, or in other words is 'user unfriendly', you'll regret your purchase decision every time you turn it on. It simply won't matter what you paid, it's not worth it!


Support. Most likely the second most important, and perhaps most overlooked factor when buying a digital readout. Imagine trying to reach a technician when you've bought a digital readout from an overseas reseller! Yet every day, people "save" $50 and buy products on eBay without stopping to think what will happen when they need service or tech support. Some digital readout resellers don't even publish a phone number! While our competitors continue to pare down or even totally eliminate their customer support, we continue to expand our Customer Service. Our Video Tutorials are the best in the industry, and are available free for you, our customers. Our tech help is the best in the business - our techs all know our readouts inside and out. Nobody knows digital readouts like DRO PROS!


Warranty. DRO PROS is proud to offer the industries safest, longest, 6 year warranty on all of our Electronica magnetic scale kits. All of our DRO PROS brand glass scale kits come with a full 3 year warranty, and our EASSON kits come standard with a 1 year warranty. DRO PROS brand warranty claims are handled directly by DRO PROS. No run-arounds, no hassle! Something not working as expected? Call us, don't get redirected overseas like the other guys!


Parts. Can you believe some resellers don't carry parts? That's right, buy from the "other guys", break a scale, and you get to replace the entire digital readout kit! Don't assume you can just go buy a different brand scale, either, because most manufacturers use different connectors on their scales. If that wasn't enough, even among those with a common connector, such as a DB9, most are hard wired differently. Finally, don't overlook the cost of parts. At DRO PROS, an 800mm replacement scale will cost you $197. A similar scale sold extensively by a European company will cost nearly $700! Finally, we have a massive inventory of parts, so rest easy - a replacement part is only a phone call away!


The Best Value. We literally search world-wide for the best value digital readout products on the planet. If there was a better digital readout package to be sold, we would be selling it. Yes, we've seen cheaper units on eBay, but there is a reason they're cheaper. Think poor quality, no parts, no manual, non-existent customer service, poor product fit/finish etc.


Customer Service. We pledge to never "over sell" you on a product that won't work well for you. Our philosophy is to try and save you money and get the best value kit tailored to the machinery you have. Many of our customers are surprised when we recommend against buying a more expensive brand. Again, our philosophy is to build customers for life. Give us a call and let us save you money!


Shipping. Most orders ship the same day, the next at the latest. We do not 'drop' ship, we have our own massive warehouse of inventory right here on site. We use UPS, you'll get a tracking number emailed to you immediately, and we cover all shipping insurance automatically.


The Company. DRO PROS is a veteran owned, American company. We enjoy selling quality products at competitive prices. We believe that  providing the best customer service is the key to success. No other company spends more time on the phone with customers than we do. Even in a down economy, our company continues to thrive and grow. We look forward to earning your business! 


The Bottom Line. Our line of digital readout's are simply the most user friendly readouts on the planet. Because of our direct marketing structure, they're also extremely affordable. Coupled with our extensive customer service and affordable parts, our Digital Readout products are simply the best value on the planet.




Domestic Shipping to the United States: All digital readout shipping is done via UPS for a flat rate of $43. You'll get a tracking number emailed direct to you from UPS, enabling you to track your shipment door to door! We cover insurance against any potential shipping damages, so no hidden fees here!


International Shipping to Canada: All of our DRO shipping is done via UPS. We charge a flat fee of $80.


International Shipping elsewhere: All of our DRO shipping is done via the United States Postal Service via a flat rate of $140.


Industry Leading Unlimited Lifetime Warranty

Electronica magnetic kits = Unlimited Lifetime Warranty

DRO PROS glass kits = 3 year warranty

EASSON glass kits = 1 year warranty


DRO PROS brand warranty claims are handled directly by DRO PROS.

No run-arounds, no hassle!

3 Year Digital Readout Warranty on all DRO PROS brand glass scale kits!


At DRO PROS, we take care of our customers. Have an issue or need some help? Let us take care of it with a toll-free call to California!


Call us now TOLL FREE at 1-877-628-6028


We accept credit cards, checks and money order for payment



Professional Digital Readout kit packages start at only $499!


Call us now at 1-707-452-8434 for all your digital readout needs!



4992 Allison Parkway Suite G

Vacaville, CA 95688 US

Phone: 707-452-8434



(707) 452-8434     (707) 452-8437     (877) 628-6028

Our Kit and Part Prices always beat Heidenhain Newall Acurite Sargon & Fagor!


Unlimited Lifetime Warranty on Magnetic DRO Kits