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A 0.7 mm point is not our measured line width
Fine and medium need a product family beside them
Find the exact refill family before comparing price
A chisel tip offers two marking orientations
Read the ink family before assuming a surface use
Retractable design does not establish an unlimited open life
A four-pack price needs a four-piece denominator
A cheaper refill is not a complete new pen
Paper weight alone does not certify an ink pairing
Highlighter-over-gel behavior is an untested pairing here
Count bodies, refills and colors separately
Check the form or institution rule before choosing a pen
An assorted pack may not cover a single-color target
Build a stock plan by required color and known count
Permanent and washable claims need an exact product
Keep the body code when the first cartridge is empty
Read a certification claim at its exact product scope
An unlisted body stays unverified in the refill finder
Reorder quantities without inventing a writing lifetime
Three dated official US offers, with different selling units