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Base wheel: 5" diameter x .020". Top wheel: 3 3/4" diameter x .020" white vinyl plastic calculator. A larger version of our popular Birth Date Calculator, this tool allows a doctor to determine the approximate date for a bab's birth. Shows 1st, 2nd, and 3rd trimester periods. 1 color ink, same, on base and top wheel, front only. Accuracy +/- may cause 1-3 day variations. To print backside, please add additional color charge.

Ad copy area: front: 3/4" high x 1 1/2" wide approx. back: 4 1/4" diameter approx.

Please contact for any inquiries