diff --git a/src/src/main/java/com/my/graphiteDigesterBg/resource/ResHeatingTubeRackSlotManager.java b/src/src/main/java/com/my/graphiteDigesterBg/resource/ResHeatingTubeRackSlotManager.java
index c7b8cfb..d677ad8 100644
--- a/src/src/main/java/com/my/graphiteDigesterBg/resource/ResHeatingTubeRackSlotManager.java
+++ b/src/src/main/java/com/my/graphiteDigesterBg/resource/ResHeatingTubeRackSlotManager.java
@@ -87,4 +87,14 @@ public class ResHeatingTubeRackSlotManager extends DiResourceManagerBase {
     public ResHeatingTubeRackSlot getErrorSlot() {
         return this.slots.get(this.errorSlotIndex);
     }
+
+    // get slot at liquid plate
+    public ResHeatingTubeRackSlot getSlotAtLiquidPlate() {
+        for (ResHeatingTubeRackSlot slot : this.slots) {
+            if (slot.rackPosition.equals(ResHeatingTubeRackSlot.LOCATION_LIQUID_PLATE)) {
+                return slot;
+            }
+        }
+        return null;
+    }
 }