414 now will be lined up with the indicator window 403 and the sma wire will be in a stretched state the cap 404 containing the indicator window 403 is now placed or firmly snapped on top of the sensor shell 400 and the sensor is ready to be used in a fresh unfrozen body of food package the sensor can now be inserted into the body of foodstuff for example chicken sausage or turkey to be frozen as an example limiting the body cross sectional area to less than 27 mm 2 can accommodate insertion into foodstuffs for example a 2 mm diameter needle shape can be suitable the food package with the sensor inserted in it can be put in a freezer to be frozen below 0 degrees celsius thus the sma wire becomes austenitic and softens losing its tension the indicator window 403 still shows a green indicator 414 as shown in fig4 b having been frozen the food package can now be inspected at an inspection station before shipping or placement in cold storage compartments and the inspector can break off or remove the engagement knob 413 before the frozen food package is placed in a freezer for storing or shipping purposes upon breakage or removal of the engagement knob 413 as long as the temperature remains below the austenitic temperature the sma wire will not contract and the green indicator 414 will show through the indicator window 403 as shown in fig4.