diff --git a/src/main/java/gregtech/common/covers/GT_Cover_ItemMeter.java b/src/main/java/gregtech/common/covers/GT_Cover_ItemMeter.java
index 9768c7b5..d353b715 100644
--- a/src/main/java/gregtech/common/covers/GT_Cover_ItemMeter.java
+++ b/src/main/java/gregtech/common/covers/GT_Cover_ItemMeter.java
@@ -19,7 +19,7 @@ public class GT_Cover_ItemMeter
         int tAll = 0;
         int tFull = 0;
         for (int i : tSlots) {
-            if ((i > 0) && (i < aTileEntity.getSizeInventory())) {
+            if ((i >= 0) && (i < aTileEntity.getSizeInventory())) {
                 tAll += 64;
                 ItemStack tStack = aTileEntity.getStackInSlot(i);
                 if (tStack != null) {
@@ -36,7 +36,7 @@ public class GT_Cover_ItemMeter
     }
 
     public int onCoverScrewdriverclick(byte aSide, int aCoverID, int aCoverVariable, ICoverable aTileEntity, EntityPlayer aPlayer, float aX, float aY, float aZ) {
-        aCoverVariable = (aCoverVariable + (aPlayer.isSneaking()? -1 : 1)) % (2 + aTileEntity.getSizeInventory());
+        aCoverVariable = (aCoverVariable + (aPlayer.isSneaking()? -1 : 1)) % (1 + aTileEntity.getSizeInventory());
         switch(aCoverVariable) {
             case 0: GT_Utility.sendChatToPlayer(aPlayer, "Normal"); break;
             case 1: GT_Utility.sendChatToPlayer(aPlayer, "Inverted"); break;