Support Ukraine

UGears STEM LAB Curvimeter

Product Description
$ 19.99
Buy any two STEM LAB models and receive this model for FREE! 
Just add all three models to the cart, and the discount is automatically applied at checkout. Enjoy your savings - $27.99 value!



When you measure the length of a straight surface, you use a ruler or a tape measurer. These tools aren't as useful when you need to measure the length of a curve; instead, you need a curvimeter, which is even more exact than a compass. To learn about this invention and build a model you'll be proud to display, purchase the UGears STEM LAB Curvimeter from our STEM Lab kits. This item looks like a clock, except that its face displays distances in centimeters, inches, meters, and feet rather than times.

+ Read More

To use the device, you roll the wheel across the item that needs measuring. As the wheel moves, the measuring hand moves as well, tracking how far the wheel has traveled. If your distance is greater than one rotation, the device also tracks how many circuits it has completed. Once you've measured the entire item, multiply the number displayed on the face by the number of rotations to find the total distance.

Although curvimeters are still used today, they are not new. Their origins are a mystery, and many different nations claim that someone from their area invented the device. For example, some people believe that Virtuvius the Roman invented the curvimeter around 23 BCE, but others think it was Zhang Heng, a Chinese intellectual. While the history of this tool is disputed, in 1873, Edward Russell Morris secured the patent for it.

Not only is the UGears STEM LAB Curvimeter a working opsiometer, but it is also one that you can easily assemble yourself. You don't have to worry about getting glue everywhere, and you don't need any special equipment. The parts are precut, although you may need a knife to loosen a few from their boards, and if you don't remove them carefully, use sandpaper to smooth down the edges. Additionally, when the gears stick or don't fit, a little candle wax on their edges takes care of the problem.

As you assemble the curvimeter, be careful not to bend or break any of the more than 100 wooden parts, but if you do have an accident, use UGears' website to request a free replacement. You also have the choice of painting the model, although this step will add a few days to the project. Avoid acrylic paints, since they tend to be so thick that it's hard for the gears to move. Watercolors are a good option as long as you let them dry completely before continuing with assembly.

When you want a craft to occupy your hands while also stimulating your mind, turn to the UGears STEM LAB Curvimeter. Whether you're building on your own or with a friend, you'll be so excited to use the device that you finish assembly in no time.

Model Size: 4.5 x 3.3 x 6.6 in
Package size: 8.1 x 7.4 x 2.5 in
Number of parts: 109
Level: Easy
Assembly Time: 2 hours
Recommended Age: 8+
Kit weight: 0.9 lbs
Manufacturer: UGears 


Part Replacement

PDF Instructions

Assembly Videos

Vendor : UGears

Whether you have questions on assembly, a wooden model kit comes with missing parts or a 3D puzzle is simply not what you expected, we encourage you to reach out to our support team for help. While we do address as many questions and concerns as possible in our FAQ section, assembly videos and PDF instruction manuals, we understand that not all issues are cookie cutter. To ensure you receive swift assistance, we provide our telephone number, an email address and a contact form on our contact page.

Commitment to Excellence

At UGears, we strive to deliver superior customer service & support at every touchpoint. From equipping each product page with a detailed product description to implementing a loyalty program for our most devoted customers, we are always striving to improve the customer experience. If you have suggestions for our mechanical gears collection, or if you run across a problem we did not catch, we want to hear about it. Your input will only help us to continue to improve.


Welcome to
Hi ,
Create an account and start earning rewards
Already have an account? 
To opt in to our Rewards Program
Refer your friends
0 completed
  • You get
  • They get
Upload Receipt
$5 off coupon
Your friend has sent you a gift. Enter your email to claim it now.
No data found!
your widget settings are an empty!