A.M. Leonard Plastic Pocket Caliper Go to amazon.com Related posts Which is the best calipers plastic? FeatureLarge 7 inch capacity, 1/4 inch scaleLightweight plastic constructionEasy-read black numeralsMeasures in inches DescriptionOur own handy calipers measure in inches. Large 7" capacity, 1/4" scale. Sturdy, lightweight plastic construction with easy-read black numerals.