General information
20 cm transparent ruler, made of high-impact polystyrene, shatterproof. 
On one length, centimetres are annotated (0 to 20 cm), with sub-markings of millimetres. 
On the opposite length, inches are annotated (0 to 8 inch), with sub-markings of 1/16 inch.
The edges of the ruler shall be bevelled.
The ruler should be comfortable to hold and use by children and be suitable for their safe and extended use.
 
Specifications
 
| 
 Material  | 
 High-impact, transparent polystyrene  | 
| 
 Dimensions  | 
 Total length: 210 mm (+/-5%) 
Calibrated length: 200 mm 
Width: 30 mm (+/-5%) 
Thickness: 3 mm minimum   | 
| 
 Edges  | 
 Bevelled, no sharp edges  | 
| 
 Markings  | 
 Graduations and numbers to be accurately, clearly, cleanly and securely printed in black. 
- 0 to 20 cm on one length, with sub-markings of millimetres, 
  
- 0 to 8 inch on the opposite length, with 1/16th inch sub-markings
  
The length annotated in centimetres must be clearly marked as “cm” and the length annotated in inches must be clearly marked as “inches”  | 
| 
 Branding  | 
 The ruler must carry no reference to the manufacturer’s company name, brand, symbol, website or contact details  | 
 
Latest update : 13/06/2019