These calipers are a great investment for anyone in need of precision measurements. They're very easy to use and offer both metric and imperial scales.The sliding mechanism is smooth and accurate. Based on our own experience these calipers are durable and work well for industrial and scientific use. However, the only con we found was that they're a bit heavy, but thats to be expected from a high-quality caliper tool. Overall, we would highly recommend these calipers for anyone in need of precise dimensional measurement..