diff --git a/frontend/src/pages/DeviceDetail.tsx b/frontend/src/pages/DeviceDetail.tsx
index 7159e53..9d1df2f 100644
--- a/frontend/src/pages/DeviceDetail.tsx
+++ b/frontend/src/pages/DeviceDetail.tsx
@@ -462,17 +462,26 @@ export function DeviceDetailPage() {
 
             <Descriptions bordered size="small" column={1} labelStyle={{ width: 180 }} style={{ marginTop: 16 }}>
               <Descriptions.Item label="Статус"><DeviceStatusBadge status={effectiveStatus} /></Descriptions.Item>
-              <Descriptions.Item label="Последний ping">
-                {device.last_seen ? (
-                  <Tooltip title={elapsedAgo(device.last_seen)}>
+              <Descriptions.Item label="Последний пинг">
+                {(device.last_ping_at ?? device.last_seen) ? (
+                  <Tooltip title={elapsedAgo((device.last_ping_at ?? device.last_seen)!)}>
                     <Space size={4} style={{ cursor: 'default' }}>
                       <ClockCircleOutlined style={{ color: '#999' }} />
-                      <span>{dayjs(device.last_seen).format('DD.MM.YYYY HH:mm:ss')}</span>
-                      {effectivePing !== null && <span style={{ color: '#999' }}>{effectivePing}мс</span>}
+                      <span>{dayjs(device.last_ping_at ?? device.last_seen).format('DD.MM.YYYY HH:mm:ss')}</span>
                     </Space>
                   </Tooltip>
                 ) : '—'}
               </Descriptions.Item>
+              {device.last_seen && device.last_ping_at !== device.last_seen && (
+                <Descriptions.Item label="Онлайн был">
+                  <Tooltip title={elapsedAgo(device.last_seen)}>
+                    <Space size={4} style={{ cursor: 'default' }}>
+                      <ClockCircleOutlined style={{ color: '#52c41a' }} />
+                      <span>{dayjs(device.last_seen).format('DD.MM.YYYY HH:mm:ss')}</span>
+                    </Space>
+                  </Tooltip>
+                </Descriptions.Item>
+              )}
               <Descriptions.Item label="Мониторинг">
                 {device.monitor_enabled
                   ? <Tag color="green">Включён</Tag>
diff --git a/frontend/src/pages/ObjectDetail.tsx b/frontend/src/pages/ObjectDetail.tsx
index ba7246f..bf703ac 100644
--- a/frontend/src/pages/ObjectDetail.tsx
+++ b/frontend/src/pages/ObjectDetail.tsx
@@ -457,20 +457,23 @@ export function ObjectDetailPage({ defaultMode = 'inventory' }: { defaultMode?:
           ? <Tooltip title="Мониторинг включен"><span style={{ color: '#faad14' }}>⟳</span></Tooltip>
           : null
 
-        const lastSeenHint = d.last_seen && d.last_ping_at && d.last_ping_at !== d.last_seen
-          ? `онлайн был: ${dayjs(d.last_seen).format('DD.MM.YYYY HH:mm')}`
-          : null
-
-        const tooltipText = [elapsedAgo(pingTime), lastSeenHint].filter(Boolean).join(' · ')
+        const showLastSeen = d.status !== 'online' && d.last_seen && d.last_ping_at !== d.last_seen
 
         return (
-          <Space size={6}>
+          <Space size={6} align="start">
             {dot}
-            <Tooltip title={tooltipText}>
-              <span style={{ color: dotColor, cursor: 'default' }}>
-                {dayjs(pingTime).format('DD.MM.YYYY HH:mm')}
-              </span>
-            </Tooltip>
+            <div>
+              <Tooltip title={elapsedAgo(pingTime)}>
+                <span style={{ color: dotColor, cursor: 'default' }}>
+                  {dayjs(pingTime).format('DD.MM.YYYY HH:mm')}
+                </span>
+              </Tooltip>
+              {showLastSeen && (
+                <div style={{ fontSize: 11, color: '#999', lineHeight: 1.4 }}>
+                  онлайн: {dayjs(d.last_seen).format('DD.MM.YYYY HH:mm')}
+                </div>
+              )}
+            </div>
             {pauseIcon}
           </Space>
         )