local minPart = workspace.min
local maxPart = workspace.max
local partToCheck = workspace.CheckPart

local minPos = minPart.Position
local maxPos = maxPart.Position

function betweenAxis(axis, axisMin, axisMax)
    return (axis > axisMin) and (axis < axisMax)
end

function inbetweenPos(pos, min, max)
    local posx, minx, maxx = pos.X, min.X, max.X
    local posy, miny, maxy = pos.Y, min.Y, max.Y
    local posz, minz, maxz = pos.Z, min.Z, max.Z

    return betweenAxis(posx, minx, maxx) and betweenAxis(posy, miny, maxy) and betweenAxis(posz, minz, maxz)

end

while true do

    local pos = partToCheck.Position

    if inbetweenPos(pos, minPos, maxPos) then
        partToCheck.BrickColor = BrickColor.Green()
    else
        partToCheck.BrickColor = BrickColor.Red()
    end

    wait()

end