Posts Tagged ‘6 digital caliper’

We offer a wide variety of high precision, high quality mechanical, electrical and electronic systems and components for the industrial motion control and measurement field.  Our quality is unmatched and we cater to our customers needs.  Please peruse our catalogue of products below.

rack_and_pinion_sys.gif (811 bytes) Reliable, High Precision Linear or Angular Rack and Pinion Shaft Optical Encoder or Resolver Measuring Systems for Motion Control (Linear or Angular Positioning Actuators)
graduated_rules.gif (542 bytes) Whittam High Quality, High Precision, Heavy Duty, Engraved, Graduated, Metal, Inch or Metric Rulers (also called Rules or Scales), Vernier Scales, Index Rings & Machine Dials made exactly to customer’s specifications
ac_motor.jpg (1412 bytes) High Performance, High Response, High Peak Torque, Low Inertia, Highest Torque to Size and Power to Size Ratios AC (Brushless) Servo Motors
DRO-sh.jpg  (1233 bytes) Advanced Technology DROs for every Linear and Angular Measurement Machine Tool Application
Metal_Linear_Scales.gif (1503 bytes) Accurate Metal Linear Scales for the above DROs)
brakes.gif  (1120 bytes) Industrial type Electric, Hydraulic & Pneumatic Clutches, Brakes, Clutch-Brakes and Discs for Mach. Tool Industry
transducers.gif (528 bytes) State of the Art Pressure, Force and Torque Transducers
pinion_shaft_encoders.gif (3249 bytes) Integral Pinion Shaft Optical Encoders/Integral Pinion Shaft Resolvers
gears.gif (756  bytes) Precision Instrument Rack Gears, Gear Rack, Pinions, Gearboxes, Helical, Bevel, Spurs, etc…
height_gauge_digital.jpg (1844 bytes) Digital Height Gauges-Innovative Technology, Customizable to Suit the Application
Digital Vernier Calipers

Terms & Conditions


Whittam Brand
Precision Rules (Rulers)
made to any length!

*Long tradition of craftsmanship

*Exceptional Quality

*Our aim is to satisfy the unique measuring needs of our valued customers

Circular Vernier made for
Picatinny Arsenal

How to read a vernier
To read a vernier scale to 1/50 mm or 0.020 mm, the vernier scale must have 49 mm divided into 50 equal spaces for use with 1.0 mm graduations on the true (or main) scale ( click here to see our example of verniers in a pop up window) or go to the example page and print it out for your reference.

First, look at the metric example.
The vernier “0” is between 30.4 cm (304mm) and 30.5 cm (305mm).  To determine the precise location, count across the vernier from “0” to see which line exactly coincides with a line on the true (or main) scale.  It is the 33rd line.   Therefore, the correct reading to 1/50mm is 304.00mm + 33 x .02mm = 304.66 mm (or 30.466 cm).

Likewise, for the inch vernier, to read to 0.001″, one must have 50 graduations on the vernier over 49 spaces of 1/20″ (or 0.05″) graduations on the true (or main) scale (1/50 x 1/20 = .001″).

Now, look at the inch example.   “0” on the vernier is between 12.000″ and 12.050″ on the true scale.  Count from “0” to the first line that coincides exactly with a line on the true (or main) scale which is the 8th.  Therefore, the correct reading is 12.000″ + 8 x 0.001″ = 12.008″.

Other combinations of main scale graduations and vernier graduations are possible for both inch and metric reading for these or other resolutions.  For example, for 1/10 mm (0.1mm) resolution, one needs only 10 graduations on the vernier over 9 (1mm) graduations on the main scale (1/10 x 1 = 0.1mm resolution, etc…

For angular verniers, the same principle applies.  For 1/10º (0.1º), one may have the main or true scale divided into 360 x 1° increments; and the vernier divided into 10 graduations over 9° of the main scale.   The reading is the same as for linear scales.

Likewise, angular verniers can be used to accurately read degrees, minutes or military units.

A caliper is defined as a device that is used to measure the distance between two opposing sides of an object.  The tips of the caliper are adjusted to fit across the points to be measured, the caliper is then removed and the distance is read by measuring between the tips with a measuring tool, such as a ruler.

A caliper is used in many fields such as metalworking, woodworking, and mechanical engineering.  It must be properly applied against the part being measured in order to take the desired measurement.  For example, when measuring the thickness of a plate a vernier caliper must be held at right angles to the piece.  Some practice may be needed to measure round or irregular objects correctly.  Accuracy of measurement when using a caliper is highly dependent on the skill of the operator. Regardless of the type, a caliper’s jaws must be forced into contact with the part being measured. As both the part and caliper are always to some extent elastic, the amount of force used affects the indication. A consistent, firm touch is correct.  Too much force results in an underindication as part and tool distort; too little force gives insufficient contact and an overindication.  This is a greater problem with a caliper incorporating a wheel, which lends mechanical advantage. This is especially the case with digital calipers, calipers out of adjustment, or calipers with a poor quality beam.

Simple calipers are uncalibrated; the measurement taken must be compared against a scale. Whether the scale is part of the caliper or not, all analog calipers—verniers and dials—require good eyesight in order to achieve the highest precision. Digital calipers have the greatest advantage in this area.

Calibrated calipers may be mishandled, leading to loss of zero. When a caliper’s jaws are fully closed, it should of course indicate zero. If it does not, it must be recalibrated or repaired. It might seem that a vernier caliper cannot get out of calibration but a drop or knock can be enough. Digital calipers have zero set buttons.

Vernier, dial and digital calipers can be used with accessories that extend their usefulness. Examples are a base that extends their usefulness as a depth gauge and a jaw attachment that allows measuring the center distance between holes. Since the 1970s a clever modification of the moveable jaw on the back side of any caliper allows for step or depth measurements in addition to external caliper measurements, in similar fashion to a universal micrometer.

…made exactly to your specifications!


High quality, competitive prices, fast delivery time, individually wrapped.  We will do the artwork for your approval prior to production!
Be original, design your unique ruler!  We can help!

Whether your project involves regularly shaped rectangular rulers with 90° or rounded corners; or irregular shape rulers with cutouts, etc…, we can help.  Please challenge us to manufacture a top quality product to your exact design.

It’s simple!

If possible, draw and send us your sketch with   dimensions, etc.. via e-mail (as an attachment) to

Or you can fax it to us at: 708-449-5703  (USA)

You can also send it to us via snail mail addressed to:   S.E.L., P.O. Box 9277, Lombard, IL  60148-9277, USA

Example of a simple hand sketch:


(Don’t forget to tell us quantity required, material, graduations and how to get in touch with you.)

If you like our prices, artwork for your approval will be sent to you once we receive your firm order.


Please tell us:

a) what material you want your rulers to be made of
b) ruler length
c) ruler width
d) ruler thickness (if you are not sure, indicate whether they are to be to be flexible or rigid)
e) whether the ruler imprint should be on the front of the ruler; or front and reverse of the ruler
f) how many colors  would you like the imprint to be
quantity (quantities) you would like us to quote on

and we will will be glad to send you a quote.

…you can just fill out “Request for Quotation” form (below) giving us as much information as possible.  Please do not forget to click “Submit Request” button.

Let us quote you on business personalized promotional rulers (logo rulers) which make excellent give away rulers at trade shows and other occasions.  Trade show rulers is out specialty.  Let us produce high quality advertising rulers for you.   Questions?  Please call us at 708-449-5700 (USA).