Diack Temperature Sensor

http://www.durgan.org/URL/?HUCFP 21 September 2014 Diack Temperature Sensor
This sensor available off the internet is used to ascertain that the temperature of the jars reach 121 C when Pressure Canning. The substance inside the glass melts when the temperature reaches 121C. A string is attached to facilitate removal from the jar after pressure canning. At 121 C all bacteria and toxins are destroyed, assuming all the material in the jar reaches this temperature.