A plastic 30 cm long rule for use by geologists, miners, surveyors & architects. The Staedtler reduction scale ruler is triangular in shape allowing up to 6 different scales to be viewed on each ruler, the ruler has been designed with grooves along the central line to allow easy holding whether your in the office or out in the field. There are 4 different rulers to choose from each with different scales displayed (although some models show similar scales) 4 Different rulers are available, each showing different scales, select the range of scales you would like from the drop down menu above.
