How to make a exception on a tool checker?

I've made a script to check player's inventory when they touch the block, but I want to make a exception (Which can make the player can carry a tool named "AccessCard") but I think that I need some help about it.

script.Parent.Touched:connect(function(hit)
    if debounce == false then
        debounce = true
        local char = hit.Parent
        local player = game.Players:GetPlayerFromCharacter(char)
        if player ~= nil then
            for i,v in pairs(char:GetChildren()) do
                if v:IsA("Tool") then
                end
                    etalert = true
                end
            end
            for i,v in pairs(player.Backpack:GetChildren()) do
                if v:IsA("Tool") then
                    uetalert = true
                end
            end

Or could your guys explain about if v:Is xxx

Thank you!