In November, 2005, the Japanese medical equipment maker NIPRO had a new instrument, COCORO METER, which uses your saliva to measure your stress level.
Just pop a spatula onto your tongue for 60 sec, plug the saliva-steeped stick into the COCORO METER, and it will be able to tell just how stressed you are.
The meter works by measuring the level of amylase in the saliva. The more stressed out you are, the higher the amount of amylase is.
Results come in four levels; low, moderate, high, very high.
COCOMO METER is compact; 87mm in height, 130mm in width, 40mm in thickness, and 190g in weight.