If you determine that it is important for you to make sure that your Market Forge STME or STME-L sterilizer is working properly in your laboratory, then you have three (3) options:

1.  Temperature Recorder:
This pressure sensitive recorder is specifically
made for use with the Market Forge Sterilmatic
Sterilizer (autoclave). Its use is for monitoring
and recording the sterilizers operating temperature
throughout its sterilizing cycles. One recording
chart can be used for a full 24 hour period.

2.  Thermometer:
This is a regular thermometer that can withstand the heat as high as 500f.  You place it inside the chamber, run your cycle, and when it is done, you can see the highest temperature that the chamber achieved.  Very reliable, and excellent as a proof that your temperature gauge shows the right temperature.
3.  Spore testing:
a.  Bowie-Dick test card to monitor pre-vacuum steam sterilizer to detect air leaks or inadequate steam penetration.
b.  Spore testing to be done away form your location
c.  Do it yourself kit