diff --git a/Content.Client/GameObjects/Components/Atmos/GasAnalyzerVisualizer.cs b/Content.Client/GameObjects/Components/Atmos/GasAnalyzerVisualizer.cs
new file mode 100644
index 0000000000..1557891e68
--- /dev/null
+++ b/Content.Client/GameObjects/Components/Atmos/GasAnalyzerVisualizer.cs
@@ -0,0 +1,52 @@
+using Content.Shared.GameObjects.Components.Atmos;
+using Robust.Client.GameObjects;
+using Robust.Client.Interfaces.GameObjects.Components;
+using Robust.Shared.Utility;
+using YamlDotNet.RepresentationModel;
+
+namespace Content.Client.GameObjects.Components.Atmos
+{
+    public class GasAnalyzerVisualizer : AppearanceVisualizer
+    {
+        private string _stateOff;
+        private string _stateWorking;
+
+        public override void LoadData(YamlMappingNode node)
+        {
+            base.LoadData(node);
+
+            _stateOff = node.GetNode("state_off").AsString();
+            _stateWorking = node.GetNode("state_working").AsString();
+        }
+
+        public override void OnChangeData(AppearanceComponent component)
+        {
+            base.OnChangeData(component);
+
+            if (component.Deleted)
+            {
+                return;
+            }
+
+            if (!component.Owner.TryGetComponent(out ISpriteComponent sprite))
+            {
+                return;
+            }
+
+            if (component.TryGetData(GasAnalyzerVisuals.VisualState, out GasAnalyzerVisualState visualState))
+            {
+                switch (visualState)
+                {
+                    case GasAnalyzerVisualState.Off:
+                        sprite.LayerSetState(0, _stateOff);
+                        break;
+                    case GasAnalyzerVisualState.Working:
+                        sprite.LayerSetState(0, _stateWorking);
+                        break;
+                    default:
+                        break;
+                }
+            }
+        }
+    }
+}
diff --git a/Content.Server/GameObjects/Components/Atmos/GasAnalyzerComponent.cs b/Content.Server/GameObjects/Components/Atmos/GasAnalyzerComponent.cs
index 3b7511c6ae..fc594dd9ac 100644
--- a/Content.Server/GameObjects/Components/Atmos/GasAnalyzerComponent.cs
+++ b/Content.Server/GameObjects/Components/Atmos/GasAnalyzerComponent.cs
@@ -1,13 +1,14 @@
 #nullable enable
-using System.Collections.Generic;
 using Content.Server.GameObjects.EntitySystems;
 using Content.Server.Interfaces.GameObjects.Components.Items;
 using Content.Server.Utility;
 using Content.Shared.Atmos;
 using Content.Shared.GameObjects.Components;
+using Content.Shared.GameObjects.Components.Atmos;
 using Content.Shared.GameObjects.EntitySystems;
 using Content.Shared.Interfaces;
 using Content.Shared.Interfaces.GameObjects.Components;
+using Robust.Server.GameObjects;
 using Robust.Server.GameObjects.Components.UserInterface;
 using Robust.Server.Interfaces.GameObjects;
 using Robust.Server.Interfaces.Player;
@@ -18,6 +19,7 @@ using Robust.Shared.IoC;
 using Robust.Shared.Localization;
 using Robust.Shared.Map;
 using Robust.Shared.ViewVariables;
+using System.Collections.Generic;
 
 namespace Content.Server.GameObjects.Components.Atmos
 {
@@ -31,6 +33,7 @@ namespace Content.Server.GameObjects.Components.Atmos
         private const float TimeBetweenSyncs = 2f;
         private bool _checkPlayer = false; // Check at the player pos or at some other tile?
         private EntityCoordinates? _position; // The tile that we scanned
+        private AppearanceComponent? _appearance;
 
         [ViewVariables] private BoundUserInterface? UserInterface => Owner.GetUIOrNull(GasAnalyzerUiKey.Key);
 
@@ -41,7 +44,10 @@ namespace Content.Server.GameObjects.Components.Atmos
             if (UserInterface != null)
             {
                 UserInterface.OnReceiveMessage += UserInterfaceOnReceiveMessage;
+                UserInterface.OnClosed += UserInterfaceOnClose;
             }
+
+            Owner.TryGetComponent(out _appearance);
         }
 
         public override ComponentState GetComponentState()
@@ -58,8 +64,9 @@ namespace Content.Server.GameObjects.Components.Atmos
         {
             _checkPlayer = true;
             _position = null;
-            UserInterface?.Toggle(session);
+            UserInterface?.Open(session);
             UpdateUserInterface();
+            UpdateAppearance(true);
             Resync();
         }
 
@@ -73,18 +80,42 @@ namespace Content.Server.GameObjects.Components.Atmos
         {
             _checkPlayer = false;
             _position = pos;
-            UserInterface?.Toggle(session);
+            UserInterface?.Open(session);
             UpdateUserInterface();
+            UpdateAppearance(true);
             Resync();
         }
 
+        public void ToggleInterface(IPlayerSession session)
+        {
+            if (UserInterface == null)
+                return;
+
+            if (UserInterface.SessionHasOpen(session))
+                CloseInterface(session);
+            else
+                OpenInterface(session);
+        }
+
         public void CloseInterface(IPlayerSession session)
         {
             _position = null;
             UserInterface?.Close(session);
+            // Our OnClose will do the appearance stuff
             Resync();
         }
 
+        private void UserInterfaceOnClose(IPlayerSession obj)
+        {
+            UpdateAppearance(false);
+        }
+
+        private void UpdateAppearance(bool open)
+        {
+            _appearance?.SetData(GasAnalyzerVisuals.VisualState,
+                open ? GasAnalyzerVisualState.Working : GasAnalyzerVisualState.Off);
+        }
+
         public void Update(float frameTime)
         {
             _timeSinceSync += frameTime;
@@ -234,7 +265,6 @@ namespace Content.Server.GameObjects.Components.Atmos
             if (eventArgs.User.TryGetComponent(out IActorComponent? actor))
             {
                 OpenInterface(actor.playerSession, eventArgs.ClickLocation);
-                //TODO: show other sprite when ui open?
             }
         }
 
@@ -245,7 +275,6 @@ namespace Content.Server.GameObjects.Components.Atmos
             if (eventArgs.User.TryGetComponent(out IActorComponent? actor))
             {
                 CloseInterface(actor.playerSession);
-                //TODO: if other sprite is shown, change again
             }
         }
 
@@ -253,8 +282,7 @@ namespace Content.Server.GameObjects.Components.Atmos
         {
             if (eventArgs.User.TryGetComponent(out IActorComponent? actor))
             {
-                OpenInterface(actor.playerSession);
-                //TODO: show other sprite when ui open?
+                ToggleInterface(actor.playerSession);
                 return true;
             }
             return false;
diff --git a/Content.Shared/GameObjects/Components/Atmos/SharedGasAnalyzerComponent.cs b/Content.Shared/GameObjects/Components/Atmos/SharedGasAnalyzerComponent.cs
new file mode 100644
index 0000000000..7b43d646c6
--- /dev/null
+++ b/Content.Shared/GameObjects/Components/Atmos/SharedGasAnalyzerComponent.cs
@@ -0,0 +1,20 @@
+using Robust.Shared.Serialization;
+using System;
+
+namespace Content.Shared.GameObjects.Components.Atmos
+{
+    [NetSerializable]
+    [Serializable]
+    public enum GasAnalyzerVisuals
+    {
+        VisualState,
+    }
+
+    [NetSerializable]
+    [Serializable]
+    public enum GasAnalyzerVisualState
+    {
+        Off,
+        Working,
+    }
+}
diff --git a/Resources/Prototypes/Entities/Objects/Specific/atmos.yml b/Resources/Prototypes/Entities/Objects/Specific/atmos.yml
index 7dce8b5aa0..1e36174408 100644
--- a/Resources/Prototypes/Entities/Objects/Specific/atmos.yml
+++ b/Resources/Prototypes/Entities/Objects/Specific/atmos.yml
@@ -15,3 +15,8 @@
     interfaces:
     - key: enum.GasAnalyzerUiKey.Key
       type: GasAnalyzerBoundUserInterface
+  - type: Appearance
+    visuals:
+    - type: GasAnalyzerVisualizer
+      state_off: icon
+      state_working: working
diff --git a/Resources/Textures/Objects/Specific/Atmos/gasanalyzer.rsi/meta.json b/Resources/Textures/Objects/Specific/Atmos/gasanalyzer.rsi/meta.json
index 97925d64e5..e1dd064c9a 100644
--- a/Resources/Textures/Objects/Specific/Atmos/gasanalyzer.rsi/meta.json
+++ b/Resources/Textures/Objects/Specific/Atmos/gasanalyzer.rsi/meta.json
@@ -15,7 +15,7 @@
             ]
         },
         {
-            "name": "atmos2",
+            "name": "working",
             "directions": 1,
             "delays": [
                 [
diff --git a/Resources/Textures/Objects/Specific/Atmos/gasanalyzer.rsi/atmos2.png b/Resources/Textures/Objects/Specific/Atmos/gasanalyzer.rsi/working.png
similarity index 100%
rename from Resources/Textures/Objects/Specific/Atmos/gasanalyzer.rsi/atmos2.png
rename to Resources/Textures/Objects/Specific/Atmos/gasanalyzer.rsi/working.png