diff --git a/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PlacementGuideView.kt b/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PlacementGuideView.kt
index 04f4810..0268ca5 100644
--- a/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PlacementGuideView.kt
+++ b/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PlacementGuideView.kt
@@ -960,11 +960,22 @@ fun PlacementGuideView(appState: AppState) {
                                 st.action == com.medithings.vesiscan.managers.AlignAction.STOP -> 60   // CH3_STABILIZE 유지 중
                                 else -> 40
                             }
+                            // 2026-07-07: GREEN 진입 후 5초 hold — 순간 flick 으로 GREEN 이 즉시
+                            //   풀려 "측정 시작" 버튼이 disable 되는 UX 문제 방지. V1 은 이미
+                            //   greenHoldMs=7000 로 동일 로직 있으나 V2 만 빠져 있었음.
+                            val v2GreenHoldMs = 5000L
+                            val nowMs = System.currentTimeMillis()
+                            val v2GreenHeld = isLocked && (nowMs - greenLockedAtMs < v2GreenHoldMs)
                             if (finalStop) {
-                                if (!isLocked) greenLockedAtMs = System.currentTimeMillis()
+                                if (!isLocked) greenLockedAtMs = nowMs
                                 isLocked = true
                                 placementPhase = PlacementPhase.GREEN
                                 if (lastLedMode != 6) { bleManager.sendLedMode(6); lastLedMode = 6 }
+                            } else if (v2GreenHeld) {
+                                // Hold 중 — isLocked / GREEN LED 유지, 단 hint 는 갱신 위에서 이미 반영.
+                                // placementScore 만 GREEN 표시 유지.
+                                placementScore = 100
+                                placementPhase = PlacementPhase.GREEN
                             } else {
                                 isLocked = false
                                 if (lastLedMode != 5) { bleManager.sendLedMode(5); lastLedMode = 5 }