diff --git a/Turtle/Turtle.lua b/Turtle/Turtle.lua
index 244c6d5..eceb8c8 100644
--- a/Turtle/Turtle.lua
+++ b/Turtle/Turtle.lua
@@ -82,4 +82,74 @@ function Turtle:reverseArray(a)
         a2[#a -i + 1] = a[i]
     end
     return a2
+end
+
+function Turtle:isInInv(item, update)
+    assert(type(item) == "string", "item must be a string")
+    self:assertInvUpdate(update)
+
+    local tag = self:resolveTag(item)
+    if (tag == "") then
+        for i = 1, 16 do
+            if self:checkItemName(item, i) == true then return true end
+        end
+    else
+        for i = 1, 16 do
+            if self:checkItemTag(tag, i) == true then return true end
+        end
+    end
+    return false
+end
+
+function Turtle:resolveTag(item)
+    local tag = ""
+    if (item == "sapling") then
+        tag = "minecraft:saplings"
+    elseif (item == "log" or item == "wood") then
+        tag = "minecraft:logs"
+    elseif (item == "coal") then
+        tag = "minecraft:coals"
+    elseif (item == "seed") then
+        tag = "forge:seeds"
+    end
+    return tag
+end
+
+function Turtle:checkItemName(name, slot)
+    assert(type(name) == "string", "tag must be a string")
+    assert(type(slot) == "number" and slot > 0 and slot <= 16, "slot must be between 1 and 16")
+    if self.inv[slot] == nil then
+        self:log("self.inv is empty at slot "..tostring(slot))
+        return false
+    end
+    if self.inv[slot].name == nil then
+        self:log("no name found")
+        return false
+    end
+    if name == "any" then
+        return true
+    end
+    if self.inv[slot].name == name then
+        return true
+    else
+        return false
+    end
+end
+
+function Turtle:checkItemTag(tag, slot)
+    assert(type(tag) == "string", "tag must be a string")
+    assert(type(slot) == "number" and slot > 0 and slot <= 16, "slot must be between 1 and 16")
+    if self.inv[slot] == nil then
+        self:log("self.inv is empty at slot "..tostring(slot))
+        return false
+    end
+    if self.inv[slot].tags == nil then
+        self:log("no tags found")
+        return false
+    end
+    if self.inv[slot].tags[tag] == true then
+        return true
+    else
+        return false
+    end
 end
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