Check if player already has item. Any help?

In this script, its connected to my datastore. This script is a local script inside the player's backpack. If the saved value of the weapon =1 or > then it gives them the weapon. However, if a player buys this in game, I dont want them having 2 of them. I want it to check and see if the player has this item in there startergear, and if they do it will destroy the script. But if it doesnt it will move along and continue the script.

Here is the script:

wait(10)
local player = game.Players.LocalPlayer
    local playerChar = player.Character --Just incase I needed it :p
if player.Tools.HighJump.Value == 0 then
    script:Destroy()

elseif player.Tools.HighJump.Value >= 1  then
    print'Player Has HighJump'
    game.Lighting.HighJump:clone().Parent = player.StarterGear
    game.Lighting.HighJump:clone().Parent = player.Backpack
end

EDIT INFO: The reason it is player.Tools.HighJump is because the 'Tools' is a model inside the player. And the 'HighJump' Is an int value. If this int value is saved as 1 from my data store, then the player will receive the ability they purchased. If the int value is 0 then that means they have not purchased it.