HapBee WPI and Twist Angle Tool

Get all the specs on any yarn, especially your handspun. Use the twist angle marks at the top for S- and Z- twist yarns. Calculate wraps per inch (WPI) or per 2.5 cm in the middle: simply wrap your yarn around the tool and count the number of wraps. Or lay a strand in the grooves for different yarn weights. You'll wonder how you ever managed your stash without it. 

Measures 5" x 2" x 1/4" (12.7 cm x 5 cm x .6 cm).