diff --git a/docs/claude/invariants-gtk-and-chrome.md b/docs/claude/invariants-gtk-and-chrome.md
index 598b833..06bd216 100644
--- a/docs/claude/invariants-gtk-and-chrome.md
+++ b/docs/claude/invariants-gtk-and-chrome.md
@@ -65,8 +65,10 @@ Part of [CLAUDE.md](../../CLAUDE.md). These are rules that cost a defect to lear
   `udpscope-tab-measure-symbolic` is the cursors and the ruler they read against, and
   `udpscope-tab-signals-symbolic` is the trigger's edge above the channel list it acts on. They are not
   reuses because a glyph the toolbar already carries means two things the moment a tab shows it too. Both
-  are **32x16** composites, one motif per half: the Measure pill is the two cursors beside the ruler, the
-  Signals pill a sine with a dashed level through it beside the channel list. That picture is shared on
+  are **32x16** composites: the Measure pill is two cursors *standing on* the scale they read against — the
+  one band with alternating marks, each marker centred on one of them, which is one instrument rather
+  than two icons in a box — and the Signals pill a sine with a dashed level through it beside the
+  channel list. That picture is shared on
   purpose: the trigger's *own* toolbar icon (`udpscope-trigger-symbolic`) is the same sine and the same
   level, one period of one-pixel stairs, so the pill and the button that turns the trigger on are
   recognisably about the same thing. The trigger glyph used to be a rising edge, and one edge names only
diff --git a/docs/claude/verification.md b/docs/claude/verification.md
index ac9b0ca..2f96e79 100644
--- a/docs/claude/verification.md
+++ b/docs/claude/verification.md
@@ -16,7 +16,7 @@ xvfb-run -a env UDPSCOPE_EXIT_AFTER_MS=8000 UDPSCOPE_ENABLE_ALL_MS=1000 \
 Two baselines every run is read against. A clean build emits **four** warnings and no more: two
 `-Wmissing-field-initializers` on `MathNode::source` and `-Woverlength-strings` on **both**
 generated GResource `.c` files — the help pages' (**514660** bytes) and the icons', whose blob is
-**12408** against C99's 4095-byte string-literal limit with the seven action icons and the two app icons
+**12624** against C99's 4095-byte string-literal limit with the seven action icons and the two app icons
 that remain (a note about a generated file, which GCC itself supports) -- re-measured when
 the tab work changed the set (that icon left, the two tab glyphs arrived, and this file's
 help page was rewritten), which did not move the count; re-measure by touching each `*.gresource.xml`
diff --git a/src/icons/scalable/actions/udpscope-tab-measure-symbolic.svg b/src/icons/scalable/actions/udpscope-tab-measure-symbolic.svg
index 2301750..f95881a 100644
--- a/src/icons/scalable/actions/udpscope-tab-measure-symbolic.svg
+++ b/src/icons/scalable/actions/udpscope-tab-measure-symbolic.svg
@@ -1,24 +1,26 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- SPDX-License-Identifier: MIT -->
 <!-- SPDX-FileCopyrightText: 2026 Martino Ferrari -->
-<!-- The Measure tab: the cursors and the ruler they read against. The caps and the dashed shafts
-     are the toolbar's cursors at the same 2px weight; the ruler's ticks hang inside its frame, which
-     needs `fill-rule="evenodd"` — a tick inside the frame's hole is three crossings deep, so it fills
-     rather than punching a second hole. Both halves are inset two pixels and centred on the same
-     line, so the pair reads as one instrument rather than as two icons that share a box. -->
+<!-- The Measure tab: two cursors standing on the scale they read against. The scale is one band with
+     alternating marks rather than the closed ruler body `udpscope-measure-symbolic` draws for the
+     Preferences window: at 32x16 a frame costs a fifth of the ink on two lines that say nothing, and
+     the cursors are what this tab is *for*. Each marker is centred on one of the marks — a cap over a
+     dashed shaft that meets the scale instead of hovering over it — so the two read as one instrument
+     rather than as two icons sharing a box. Both use the 2px weight of every other icon here, and
+     everything is inset two pixels, because art flush with the cell edge is what a button or a crop
+     clips. -->
 <svg height="16px" width="32px" viewBox="0 0 32 16" xmlns="http://www.w3.org/2000/svg">
-  <path fill="#2e3436"
-        fill-rule="evenodd" d="M2 2 H7 V4 H2 Z
-                          M10 2 H15 V4 H10 Z
-                          M3 5 H5 V7 H3 Z
-                          M3 9 H5 V11 H3 Z
-                          M3 13 H5 V15 H3 Z
-                          M10 5 H12 V7 H10 Z
-                          M10 9 H12 V11 H10 Z
-                          M10 13 H12 V15 H10 Z
-                          M17 5 H30 V12 H17 Z
-                          M19 7 H28 V10 H19 Z
-                          M20 7 H21 V9 H20 Z
-                          M23 7 H24 V9 H23 Z
-                          M26 7 H27 V9 H26 Z"/>
+  <path fill="#2e3436" d="M2 12 H30 V14 H2 Z
+                          M5 9 H7 V12 H5 Z
+                          M9 10 H11 V12 H9 Z
+                          M13 9 H15 V12 H13 Z
+                          M17 10 H19 V12 H17 Z
+                          M21 9 H23 V12 H21 Z
+                          M25 10 H27 V12 H25 Z
+                          M7 3 H12 V6 H7 Z
+                          M8 7 H11 V10 H8 Z
+                          M8 10 H11 V12 H8 Z
+                          M19 3 H24 V6 H19 Z
+                          M20 7 H23 V10 H20 Z
+                          M20 10 H23 V12 H20 Z"/>
 </svg>