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To save $20 off the package price, these plastic vernier calipers may be substituted for the digital precision caliper normally included as part of the Basic, Design, and Complete packages. When ordering packages, if you type the word "plastic" into the "enter coupon" box your package price will be reduced by $20. This plastic caliper will allow you to get approximate measurements from your PWD Car quickly into the Virtual Race simulator. However, a youngster may need help in using the vernier scale, although an instruction sheet is included. Also, the plastic digital caliper is not very accurate for measuring small distances such as axle diameter.