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사진확대

Test Scoring Type Special Soft Lead - Test Scoring Pencils - Express Pencils (36 Pieces)
ASIN번호 B07T43NXRW
상품상태 New   
상품구분 Office Products / Office & School Supplies
브랜드 Visit the Express Pencils Store
판매자 EXPRESS PENCILS
판매자위치 미확인
현지 판매 가격
$15.95
상품가격 상세보기
관련상품



상품특징
Make sure this fits by entering your model number.Pink eraser.Hexagonal, silver barrel.Special soft lead.Registers correctly on Scantron OMR test scoring machines.
상품설명
Many machine-read tests are still scored from cards marked with this pencil. Scantron and other manufacturers of modern optical test scoring machines recommend any HB #2 medium-soft lead pencil. There are no "standard" HB #2 pencils, however, because manufacturers worldwide have their own individual lead hardness criteria -- some even use an all-plastic "lead." Thus, this pencil thrives because it is made with a concentration of actual graphite whose opaque density ensures that it will trigger optical scanners. Another real secret of its popularity is that it writes very smoothly, with a dark line. It is probably the most popular writing pencil among teachers, and crossword and sudoku puzzle enthusiasts. Historical Note: There once were scanning systems that identified pencil marks by looking for their electrical conductivity. Electrical feelers at each end of the markable area made contact with that area and could detect pencil marks via the lead's ability to conduct electric current. To ensure enough conductivity, those forms had to be filled out with special pencils having high conductivity leads. The IBM Electrographic pencil was such a pencil. Pencil leads conforming to electrographic technology were often referred to as "mark sense" leads and were widely available until the late 1960s.
















상품특징
Make sure this fits by entering your model number.Pink eraser.Hexagonal, silver barrel.Special soft lead.Registers correctly on Scantron OMR test scoring machines.
상품설명
Many machine-read tests are still scored from cards marked with this pencil. Scantron and other manufacturers of modern optical test scoring machines recommend any HB #2 medium-soft lead pencil. There are no "standard" HB #2 pencils, however, because manufacturers worldwide have their own individual lead hardness criteria -- some even use an all-plastic "lead." Thus, this pencil thrives because it is made with a concentration of actual graphite whose opaque density ensures that it will trigger optical scanners. Another real secret of its popularity is that it writes very smoothly, with a dark line. It is probably the most popular writing pencil among teachers, and crossword and sudoku puzzle enthusiasts. Historical Note: There once were scanning systems that identified pencil marks by looking for their electrical conductivity. Electrical feelers at each end of the markable area made contact with that area and could detect pencil marks via the lead's ability to conduct electric current. To ensure enough conductivity, those forms had to be filled out with special pencils having high conductivity leads. The IBM Electrographic pencil was such a pencil. Pencil leads conforming to electrographic technology were often referred to as "mark sense" leads and were widely available until the late 1960s.












2021-01-13 11:01:57