Transparent ruler with tactile markings

Ruler 30cm, for visually impaired people, transparent.
Every 1 cm alternating translucent yellow.
Practical stop edge at the zero.
Markings indicate every centimeter with a tactile line. A dot marks the 5mm intervals.
A slightly rough grip surface runs along the lower edge.
Material: plastic, thickness 2mm

Shipping within 3-5 working days after advance payment on account, shipping costs 4.19€  within Germany