diff --git a/M02_MasterTemplete/DataFlow/M02_DF_UnitPick.ts b/M02_MasterTemplete/DataFlow/M02_DF_UnitPick.ts
index 2883c6835..ed0cd9dd0 100644
--- a/M02_MasterTemplete/DataFlow/M02_DF_UnitPick.ts
+++ b/M02_MasterTemplete/DataFlow/M02_DF_UnitPick.ts
@@ -106,7 +106,6 @@ export function createUnitPick(opts: UnitPickOptions): HTMLElement {
   const open = createButton({
     label: opts.value || NO_UNIT,
     variant: "ghost",
-    size: "sm",
     disabled: opts.readOnly,
     onClick: () => toggle(),
   });
diff --git a/resources/tester/ui_checks/51-5_단위단추_크기.js b/resources/tester/ui_checks/51-5_단위단추_크기.js
new file mode 100644
index 000000000..9fd87f7d3
--- /dev/null
+++ b/resources/tester/ui_checks/51-5_단위단추_크기.js
@@ -0,0 +1,35 @@
+/* 51-5 — 단위 고르기 단추(공용 M02_DF_UnitPick) 높이 · 글자 = [저장] 단추와 같음
+ * 시작 화면: M02 마스터 템플릿 · 마스터 층(#/m02-master-template?open=구조물조합&root=master) · 시스템 관리자
+ * 부르는 법: orca eval --expression "$(tr '\n' ' ' < 이 파일)" (async 식 · JSON 글을 돌려줌)
+ * 하는 일: item1 → 일위대가 [수정] 상세 → 단위 단추 · [저장] 단추 높이 · 글자 크기 잼
+ * 기대: ok = true (|unit.h − save.h| ≤ 1 · 글자 같음)
+ */
+(async () => {
+  const w = (ms) => new Promise((r) => setTimeout(r, ms));
+  document.querySelector('[data-node="i|item1"]')?.click();
+  await w(2500);
+  const card = [...document.querySelectorAll(".m02-struct__card")].find((c) =>
+    c.querySelector("table.m02-labrow tbody tr[data-labor-logic]"),
+  );
+  if (!card) return JSON.stringify({ error: "일위대가 카드 없음" });
+  [...card.querySelectorAll(".m02-struct__card-tools button")]
+    .find((b) => b.innerText.trim() === "수정")
+    ?.click();
+  await w(3000);
+  const read = (b) =>
+    b && {
+      h: Math.round(b.getBoundingClientRect().height * 10) / 10,
+      font: getComputedStyle(b).fontSize,
+    };
+  const unit = read(document.querySelector('[data-labor-field="단위"] .ui-btn'));
+  const save = read(
+    [...document.querySelectorAll("button")].find(
+      (b) => b.innerText.trim() === "저장" && b.offsetParent,
+    ),
+  );
+  return JSON.stringify({
+    unit,
+    save,
+    ok: !!unit && !!save && Math.abs(unit.h - save.h) <= 1 && unit.font === save.font,
+  });
+})();