Perfect for measuring birth weights of newborn beef calves within 24 hours after birth. You simply place the tape around the coronary band of the front hoof, tighten and read the circumference in centimetres and the birth weight in kgs from the tape scale. One side measures bulls, the other heifers. Weight at birth may vary + or – 3.2 kgs for bulls and + or – 2.9 kgs for heifers, due to hour of age and shrink or fill.