diff --git a/frontend/js/labs/stereo.js b/frontend/js/labs/stereo.js
index b495f0d..43fa899 100644
--- a/frontend/js/labs/stereo.js
+++ b/frontend/js/labs/stereo.js
@@ -115,7 +115,8 @@ class StereoSim {
     this._labelGroup   = new THREE.Group();
     this._sectionGroup = new THREE.Group();
     this._sphereGroup  = new THREE.Group();
-    this._measureGroup = new THREE.Group();
+    this._measureGroup     = new THREE.Group();
+    this._measurePickGroup = new THREE.Group();
     this._gridGroup    = new THREE.Group();
     this._markGroup    = new THREE.Group();
     this._derivedGroup = new THREE.Group();
@@ -124,6 +125,7 @@ class StereoSim {
     this.scene.add(this._sectionGroup);
     this.scene.add(this._sphereGroup);
     this.scene.add(this._measureGroup);
+    this.scene.add(this._measurePickGroup);
     this.scene.add(this._markGroup);
     this.scene.add(this._derivedGroup);
     this.scene.add(this._labelGroup);
@@ -310,10 +312,52 @@ class StereoSim {
     this._pointMode = false;
     this._angleMode = null;
     this._measurePicks = [];
-    if (!on) { this._clearGroup(this._measureGroup); this._measurements = []; }
+    this._clearGroup(this._measurePickGroup);
+    if (!on) { this._measurements = []; this._rebuildMeasureGroup(); }
     this.renderer.domElement.style.cursor = on ? 'crosshair' : 'grab';
   }
 
+  removeLastMeasurement() {
+    if (!this._measurements.length) return;
+    this._measurements.pop();
+    this._rebuildMeasureGroup();
+  }
+
+  clearMeasurements() {
+    this._measurements = [];
+    this._measurePicks = [];
+    this._rebuildMeasureGroup();
+    this._clearGroup(this._measurePickGroup);
+  }
+
+  _rebuildMeasureGroup() {
+    this._clearGroup(this._measureGroup);
+    for (const m of this._measurements) {
+      const g = new THREE.Group();
+      // spheres at endpoints
+      for (const pos of [m.posA, m.posB]) {
+        const sGeo = new THREE.SphereGeometry(0.14, 12, 12);
+        const sMat = new THREE.MeshBasicMaterial({ color: 0xFFD166 });
+        const s    = new THREE.Mesh(sGeo, sMat);
+        s.position.copy(pos);
+        g.add(s);
+      }
+      // dashed line
+      const lineGeo = new THREE.BufferGeometry().setFromPoints([m.posA, m.posB]);
+      const lineMat = new THREE.LineDashedMaterial({ color: 0xFFD166, dashSize: 0.15, gapSize: 0.1, transparent: true, opacity: 0.9 });
+      const line    = new THREE.Line(lineGeo, lineMat);
+      line.computeLineDistances();
+      g.add(line);
+      // label
+      const mid   = new THREE.Vector3().addVectors(m.posA, m.posB).multiplyScalar(0.5);
+      const label = this._makeTextSprite(`${m.from}${m.to} = ${m.dist}`, '#FFD166', 40);
+      label.position.copy(mid).add(new THREE.Vector3(0, 0.3, 0));
+      label.scale.set(1.4, 0.5, 1);
+      g.add(label);
+      this._measureGroup.add(g);
+    }
+  }
+
   setAngleMode(mode) {
     // mode: 'edge' | 'linePlane' | 'dihedral' | null
     this._angleMode = mode;
@@ -1718,34 +1762,24 @@ class StereoSim {
 
     this._measurePicks.push(bestPick);
 
-    // Highlight picked point
+    // Highlight first pick in temporary group
     const sGeo = new THREE.SphereGeometry(0.14, 12, 12);
     const sMat = new THREE.MeshBasicMaterial({ color: 0xFFD166 });
     const s = new THREE.Mesh(sGeo, sMat);
     s.position.copy(bestPick.pos);
-    this._measureGroup.add(s);
+    this._measurePickGroup.add(s);
 
     if (this._measurePicks.length === 2) {
       const [a, b] = this._measurePicks;
       const dist = a.pos.distanceTo(b.pos);
-      const mid = new THREE.Vector3().addVectors(a.pos, b.pos).multiplyScalar(0.5);
-
-      // Dashed line
-      const pts = [a.pos, b.pos];
-      const lineGeo = new THREE.BufferGeometry().setFromPoints(pts);
-      const lineMat = new THREE.LineDashedMaterial({ color: 0xFFD166, dashSize: 0.15, gapSize: 0.1, transparent: true, opacity: 0.9 });
-      const line = new THREE.Line(lineGeo, lineMat);
-      line.computeLineDistances();
-      this._measureGroup.add(line);
-
-      // Label
-      const label = this._makeTextSprite(`${a.label}${b.label} = ${dist.toFixed(2)}`, '#FFD166', 40);
-      label.position.copy(mid).add(new THREE.Vector3(0, 0.3, 0));
-      label.scale.set(1.4, 0.5, 1);
-      this._measureGroup.add(label);
-
-      this._measurements.push({ from: a.label, to: b.label, dist: Math.round(dist * 100) / 100 });
+      this._measurements.push({
+        from: a.label, to: b.label,
+        dist: Math.round(dist * 100) / 100,
+        posA: a.pos.clone(), posB: b.pos.clone(),
+      });
       this._measurePicks = [];
+      this._clearGroup(this._measurePickGroup);
+      this._rebuildMeasureGroup();
     }
   }
 
diff --git a/frontend/lab.html b/frontend/lab.html
index 1fb823b..fa2a280 100644
--- a/frontend/lab.html
+++ b/frontend/lab.html
@@ -3670,6 +3670,8 @@
           <div style="display:flex;flex-wrap:wrap;gap:4px;margin-bottom:4px">
             <button class="gp-btn" id="stereo-unfold-btn" onclick="stereoUnfold(this)">Развёртка</button>
             <button class="gp-btn" id="stereo-measure-btn" onclick="stereoMeasure(this)">Измерение</button>
+            <button class="gp-btn" onclick="stereoMeasureUndo()">Удалить посл.</button>
+            <button class="gp-btn" onclick="stereoMeasureClear()">Очистить</button>
           </div>
 
           <div class="gp-section-title" style="margin-top:8px">Углы и расстояния</div>
@@ -8223,6 +8225,14 @@
     if (stereoSim) stereoSim.toggleMeasure(on);
   }
 
+  function stereoMeasureUndo() {
+    if (stereoSim) stereoSim.removeLastMeasurement();
+  }
+
+  function stereoMeasureClear() {
+    if (stereoSim) stereoSim.clearMeasurements();
+  }
+
   function stereoToggleHeight(btn) {
     const on = !btn.classList.contains('active');
     btn.classList.toggle('active', on);