A device and a method of sensing and transmitting physiological pressures and body temperatures are disclosed. A method particularly adapted for crowing cross-shaped crystals includes forming a gel matrix through cooling of a mixture of potassium bitartrate, boiling water and gelatin to less than 65 F. Controlled by a comparator device 6 and a control unit 5, the printing parameters are corrected in situ, if necessary. In addition, a properly authenticated user of the recipient’s email account will be able to designate any email as being a high security level email or a normal security level email.