Redstone Comparator

For other redstone-related objects found in Minecraft, see Redstone (disambiguation).

Redstone Comparators are a special redstone block that are similar to Redstone Repeaters. Redstone comparators have a third torch on them, allowing for complex redstone features. Redstone comparators have three ports, with two being for input, the third for output. Redstone comparators also measure how many things an entity holds or weighs, allowing for some very interesting adventure maps or mechanisms. They can also detect how many items are stored in a container block (such as a Chest, Hopper, Dropper or Minecart with Chest). It can be utilized in a Redstone Circuit. It makes the same sound as Wood when broken.

A tutorial on YouTube is available that shows how to build with redstone comparators.

A comparator has two "modes", "compare" mode and "subtract" mode, which players can tell by the status of the single torch on the front. The default mode is "compare" mode, which means that it will compare the signal it receives from the side to the signal it receives from behind. If the signal from the side is stronger than the one from behind, it won't give off a signal. If the signal from the side is weaker than the one from behind, the comparator will give off a signal equal to the one it receives from behind.

On "subtract" mode, the comparator will produce a signal equal to the signal it receives from behind minus the signal it receives from the side.

Crafting

Redstone Comparator
None	Redstone Torch	None
Redstone Torch	Nether Quartz	Redstone Torch
Stone	Stone	Stone

Gallery

The difference between a redstone comparator and a redstone repeater. The comparator is on the left.

Redstone comparator recipe

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Video

Finally Explained How Do Minecraft Comparators Work?

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Blocks
Natural	Air • Stone • Granite • Andesite • Diorite • Bedrock • Clay( Terracotta) • Cobblestone ( Moss) • Cobweb • Dirt • Gravel • Coarse Dirt • Bone • Ice • Monster Spawner • Sand ( Red) • Sandstone ( Red) • Obsidian • Snow • Sponge • Wet Sponge • Stone Brick ( Cracked • Moss • Chiseled) • Prismarine ( Dark • Brick) • Sea Lantern
Manufactured	Bookshelf • Brick • Wool ( Carpet) • Concrete( Powder) • Conduit • Dried Kelp Block • Fence • Glass ( Pane) • Stained Glass ( Pane) • Glazed Terracotta • Hay Bale • Iron Bars • Jack-O-Lantern • Ladder • Painting • Scaffolding • Slabs • Smooth Stone • Smooth Sandstone • Smooth Quartz • Smooth Red Sandstone • Slime • Snow • Stairs • Walls • Wooden Planks
Ore	Coal Ore • Diamond Ore • Emerald Ore • Gold Ore • Iron Ore • Lapis Lazuli Ore • Redstone Ore Nether Quartz Ore
Mineral Blocks	Block of Diamond • Block of Emerald • Block of Gold • Block of Iron • Lapis Lazuli Block • Block of Quartz • Block of Redstone • Block of Coal
Utility	Bed • Brewing Stand • Cake • Cauldron • Chest • Shulker Box • Crafting Table • Enchantment Table • Furnace • Jukebox • TNT • Anvil • Blast Furnace • Barrel • Bell • Campfire • Cartography Table • Compost • Fletching Table • Grindstone • Lantern • Lectern • Loom • Smithing Table • Smoker • Stonecutter • Dispenser • Redstone Lamp • Door • Fence Gate • Lever • Note • Piston ( Sticky) • Pressure Plate • Rail ( Powered • Detector • Activator) • Redstone ( Wire • Torch • Repeater • Comparator) • Trapdoor • Trapped Chest • Hopper • Dropper • Daylight Detector • Tripwire Hook • Observer
Plants	Cactus • Dead Bush • Chorus Plant • Flowers • Grass ( Grass • Fern) • Leaves • Lily Pad • Melon • Mushrooms ( Huge)  • Mycelium • Podzol • Pumpkin • Saplings • Sugar Cane • Vines • Wheat • Log • Corals • Kelp • Sweet Berry Bush
Liquids	Lava • Water
Non-Solid	Fire • Sign • Torch • Banner
The Nether	Glowstone • Netherrack • Nether Brick ( Fence)  • Nether Quartz • Nether Wart • Soul Sand • Magma Block
The End	Dragon Egg • End Stone • Purpur • Endstone Brick • End Rod • Dragon Head • Ender Crystal
Creative only	Barrier • Structure Block • Jigsaw
Pocket Edition only	Stonecutter (old) • Nether Reactor
Technical	Piston Arm • Block 36 • Burning Furnace • Glowing Redstone Ore • Off-state Redstone Torch • Active Redstone Repeater • Flowing Water • Flowing Lava • Farmland • Pumpkin Stem • Melon Stem • Block 97 • Portal • End Portal Frame • End Portal
Unused	Locked Chest
Removed	Gear • Dirt Slab • Cyan Flower • Camera(PE)
Unimplemented	Crying Obsidian