Assuming you are looking for a tool to make highly precise measurements in inches, one option would be a micrometer. A micrometer is a tool that can measure extremely small distances and can be accurate to within 0.0001 of an inch. This makes it an ideal tool for making precise measurements. Another option for making precise measurements would be a vernier caliper. A vernier caliper can also measure very small distances and can be accurate to within 0.0001 of an inch.