Yarn Gauge
$8.50
or 4 fortnightly payments of $2.13 with 
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To calculate the tension or gauge of your yarn use this simple tool. Wrap the yarn in either the 25 or 12.5mm (1-1/2in) slot and count the number of wraps. Made from lacquered Silver Beech hardwood. Comes complete with leather loop and wrap/gauge table.
