Fowler Digital Caliper with Bluetooth Communication Specifications Include... 0-4" / 100mm Measuring Range 0.0005" / 0.01mm Resolution 0.001" / 0.02mm Accuracy Features Include... HID Bluetooth Communications Large easy-to-read LCD display Heavy Duty Frame with 4-Way Measuring IP67 Rated Protection Includes Case Includes NIST Traceable Certification