diff --git a/app/src/main/java/com/example/hpostesting/presentation/hemocube/hb/HBHemoCubeFragment.kt b/app/src/main/java/com/example/hpostesting/presentation/hemocube/hb/HBHemoCubeFragment.kt
index fb31126..dbea0ad 100644
--- a/app/src/main/java/com/example/hpostesting/presentation/hemocube/hb/HBHemoCubeFragment.kt
+++ b/app/src/main/java/com/example/hpostesting/presentation/hemocube/hb/HBHemoCubeFragment.kt
@@ -156,6 +156,10 @@ class HBHemoCubeFragment : Fragment() {
                 override fun onClickNegativeButton() {
                     listenToHemoCube()
                     startBufferProcess()
+                    with(sharedPreferences.edit()) {
+                        putString(Constants.HB_BUFFER_VALUE_1, "")
+                        apply()
+                    }
                 }
 
                 override fun onClickPositiveButton() {
@@ -297,7 +301,7 @@ class HBHemoCubeFragment : Fragment() {
                     led1Buffer = led1BufferForDevice
                     this.led1Sample = led1Sample
                     this.led1Average = led1Average
-                    this.hbEstimation = calculateRatio(led1Average)
+                    this.hbEstimation = ((led1Average-0.0177)/0.0237)
                     this.resultData = fullReadOutput
                     if (!isBufferValueAvailable()) {
                         with(sharedPreferences.edit()) {