Knitpro View Sizer Knitting Needle Gauge Ruler
Handy little plastic tool which allows you to easily find out what size your needles are if the original mark has been worn away.
Also provides a conversion from metric into US sizes.
Measures sizes from 2mm - 12mm (US 0 - 17)
Also includes 6in / 14.5cm ruler plus see through section giving 4ins/10cm tension gauge which can be laid onto knitted piece to check work is correct.
Free UK p&p