Pregnancy Double Wheel Calculator / Wheel Chart Calendar

Approved Accuracy: Simple and clean charting indicates first date of last period, probable ovulation, probable implantation, 1st trimester,2nd trimester, 3rd trimester, and expected date of confinementClassic Design: Small handy wheels with printed days, weeks and months for calculating lead times, to efficiently predict the approximate date of deliveryGreat Value: Made of durable and lightweight PVC plastic material, designed by medical professionals and tested by thousands of actual users. 4.25" Diameter