function ClassicPowder()

tpt.start_getPartIndex()
while tpt.next_getPartIndex() do
local index = tpt.getPartIndex()
if tpt.get_property("type",index) == 159 then
local a = tpt.get_property("ctype",index)*10 + 273.15
tpt.set_property("temp",a,index)
end
if tpt.get_property("type",index) == 189 then
local a = tpt.get_property("ctype",index) + 273.15
tpt.set_property("temp",a,index)
end
end

end

tpt.register_step(ClassicPowder)

How to use

1.Create a .txt file

2.Copy the above to the file

3.Change the file name extension into .lua

4.Copy the file to the script folder

5.Open Script Manager,and open "local"

6.Choose the file you have made just now