diff --git a/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt b/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt
index fdc5cd9..362e32a 100644
--- a/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt
+++ b/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt
@@ -403,7 +403,7 @@ class HemoCubeFragment : Fragment() {
             val led2Average = log10(led2BufferForDevice?.div(led2SampleForDevice!!) ?: 0.0)
             val led3Average = log10(led3BufferForDevice?.div(led3SampleForDevice!!) ?: 0.0)
             val led4Average = log10(led4BufferForDevice?.div(led4SampleForDevice!!) ?: 0.0)
-            val deviceRatio = led1Average / led3Average
+            val deviceRatio = led3Average / led1Average
 
             if (led1Average < 0 || led2Average < 0) {
                 activity?.runOnUiThread {