Technical Specifications Resolution: 0.01mm / 0.0005in Power supply: 1.5V button cell measuring speed: ≤1.5m / s Working conditions: Temperature (0 ~ +40) ℃; relative humidity ≤80% Storage Temperature: (--10 ~ +60) ℃ Use 1, the preparatory work: (1) dry-foot body protective film surface, each measuring surface clean. (2) Loosen the fastening screws, is moving foot box, check the screen and all buttons work properly. 2. Measure: (1) Press the power on / off key (ON / OFF), turn on the power; (2) Press measuring unit key (mm), select the desired system of units; and (3) mobile foot frame, so that the two outer measuring surface After feeling the contact press zeroing key (ZERO) set to zero, then the normal measurement; (4) the measurement is completed, press the power on / off key (ON / OFF), turn off the power. Egg shape index = egg vertical diameter length / diameter long slender egg (L): oval egg shape index greater than 1.35 (M): egg shape index between 1.3-1.35 spherical (S): egg shape index less than 1.3