A 0.7 mm point is not our measured line width

The selected specification

Pentel identifies the selected EnerGel RTX BL77 as a medium 0.7 mm liquid-gel pen with a metal tip. That is the maker product specification. This site has not measured a stroke on paper or converted the catalog point size into a tested line width. A page description, tip photograph or generic illustration is not an independent measurement of the deposited mark.

What the number does not establish

Do not compare a 0.7 mm pen point directly with a chisel highlighter width as though the numbers describe the same geometry. A ball tip and a chisel edge offer different marking arrangements. Even where a maker uses the phrase medium line, retain its catalog wording rather than publishing an exact stroke measurement that we did not obtain.

Compare a specific setup

If narrow form boxes or a particular notebook are the reason for buying, record the exact pen model, ink color and paper product. Check the form requirements and ask whether a sample is available before committing to a large order. A nominal tip-size comparison can shortlist candidates, but it cannot settle unmeasured behavior on that specific surface.

A decision you can make now

For the priced example, you can identify BL77-A as the black 0.7 mm selected pen and LR7-A as its supported refill family from the official refill page. You cannot conclude that every 0.7 mm refill fits the body or that the pen creates an exactly 0.7 mm dry line. Use those two separate conclusions when placing the order.

A point-size shortlist

A useful shortlist might contain the selected 0.7 mm BL77 and another exactly identified size from its own maker page. Keep each size as a catalog specification. If your task needs a narrower mark, do not substitute a different cartridge solely from that goal: the body relationship and actual paper behavior still need their separate checks.

Save the unanswered fields

Write measured line width: unverified in the record for this site. This is more useful than copying 0.7 mm into a measurement column. If a supplier later provides a relevant measurement, retain its method and conditions beside it. We have supplied no calibrated image or dry-stroke test that could fill that field today.

Before you decide

• Keep the exact selected SKU, color and selling unit
• Check current maker scope and the actual seller offer
• Separate your assumptions from measured performance