Sorry, ask any real machinist if a "good" set of digital calipers can be had for $15, and the resounding answer will be no! Anyone that plays this whole reloading and gunsmith game to any degree of finesse should have a quality 1 inch micrometer and a "good" 6 vernier caliper. Both can be had at a reasonable price by just looking, new or used and will not be Chinese. Ebay, pawn shops etc. are full of these tools from retired machinists. Starrett, Brown and Sharpe, SPI are a quality choice.