Infinity Reloaded item transfer rate

p=peripheral.wrap("bottom")
while true do

time1=os.time()

amount1=p.getItemMeta(2).count

sleep(30)

amount2=p.getItemMeta(2).count

time2=os.time()-time1
difference=math.abs((amount1-amount2)/(time2*1000))
print(difference.." n/t - "..(difference*20).." n/s")

end

shell.run("lua")