diff --git a/mcl_comparators/init.lua b/mcl_comparators/init.lua
index 7c472e9..ca39ec6 100644
--- a/mcl_comparators/init.lua
+++ b/mcl_comparators/init.lua
@@ -107,25 +107,31 @@ end
 
 
 -- weather pos has an inventory that contains at least one item
-local function container_inventory_nonempty(pos)
+local function container_inventory_nonempty(pos, rule)
 	--    https://minecraft.fandom.com/wiki/Redstone_Comparator#Measure_block_state
 	--    signal strength = floor(1 + ((sum of all slots' fullnesses) / (number of slots in container)) × 14)
     --    fullness of a slot = number of items in slot / max stack size for this type of item
-	
-	
-	
+
 	local invnode = minetest.get_node(pos)
+
 	local invnodedef = minetest.registered_nodes[invnode.name]
 	-- Ignore stale nodes
-	if not invnodedef then return 0 end
+	if not invnodedef then return 0, false end
 
+	if minetest.get_item_group(invnode.name, "opaque") == 1 and rule then
+		--found opaque block -> check next block
+		local backback_pos = vector.add(pos, rule)
+		local bb_voltage, _ = container_inventory_nonempty(backback_pos, nil)
+		return bb_voltage, true
+	end
+	
 	-- Only accept containers. When a container is dug, it's inventory
 	-- seems to stay. and we don't want to accept the inventory of an air
 	-- block
-	if not invnodedef.groups.container then return 0 end
+	if not invnodedef.groups.container then return 0, false end
 
 	local inv = minetest.get_inventory({type="node", pos=pos})
-	if not inv then return 0 end
+	if not inv then return 0, false end
 
 	
 	--minetest.log("action", mesecon.postostring(pos) .. "-->" .. "container_inventory_nonempty.inv= " .. mesecon.tabletostring(inv:get_lists()))
@@ -159,10 +165,10 @@ local function container_inventory_nonempty(pos)
 	if item_count>0 then
 		local voltage = math.floor(1 + (item_count/inv_space*14))
 		--minetest.log("action", mesecon.postostring(pos) .. "-->" .. "container_inventory_nonempty.voltage= " .. voltage)	
-		return voltage
+		return voltage, false
 	end
 
-	return 0
+	return 0, false
 end
 
 -- weather pos has an constant signal output for the comparator
@@ -179,15 +185,17 @@ local function comparator_desired_on(pos, node)
 	local voltage = 0
 	if back_rule then
 		local back_pos = vector.add(pos, back_rule)
-		--local _, vo_back = mesecon.is_power_on(back_pos)
-		--local _, _, vo_back = mesecon.is_powered(back_pos)
 		local _, _, vo_back = mesecon.is_powered(pos, back_rule)
 		
-		
-		local vo_coin = container_inventory_nonempty(back_pos)
+		local vo_coin, spread = container_inventory_nonempty(back_pos, back_rule)
 		
 		local vo_sso = static_signal_output(back_pos)
 		
+		if vo_coin>=1 and spread and vo_back<15 then 
+			--container through opaque block and block is powerd less than 15 -> ignore powered block
+			vo_back=0
+		end
+		
 		voltage = math.max(vo_back, vo_coin, vo_sso)
 	end
 
@@ -476,7 +484,7 @@ minetest.register_abm({
 		"mcl_comparators:comparator_off_comp",
 		"mcl_comparators:comparator_off_sub",
 	},
-	neighbors = {"group:container", "group:comparator_signal"},
+	neighbors = {"group:container", "group:comparator_signal", "group:opaque"},
 	interval = 1,
 	chance = 1,
 	action = update_self,