i have a Italian oven and its second hand so its temperature digits had removed by the user or it was miss used ,so now I don't know how to check its original temperature

tz, October 2012

Try posting with Make Model etc. Without that. Nobody know what you are talking about.
AS much detail as possible.
Make Model Display type, what is on display what is not on display Etc Etc. THE more you give us, The more likely you are to get a result.

SD, October 2012