10 Best Calibration Surface Plates 2025

When it comes to dimensional calibration, precision is key. That's why we reviewed and scored many Calibration Surface Plates in the category, ranging from a 7.4 score up to a impressive 9.7 score. Our top pick, the INSIZE 6900-A11 Granite Surface Plate, 12" x 18" x 3", Grade A, earned the highest spot on our list, and for good reason. Not only does it provide a perfectly flat surface for accurate measurements, but its durable construction ensures it will last for years to come. If you're looking for a reliable and precise surface plate for your calibration needs, the INSIZE 6900-A11 is the one for you.