Abstract: Aspects of the present invention enable a storage device (e.g., a recordable book, toy, computing device) to be controlled with a single control button that performs multiple functions. Different interactions with the button produce a different control input. In one aspect, the storage device is an audio recording device that can record, lock, unlock, transfer to a separate storage device, or play back one or more audio recordings. These five functions (i.e., recording, locking, unlocking, transferring, and playing back) are initiated or facilitated by depressing a single button located on the audio storage device for different lengths of time or in different patterns. Audio recordings may be played in response to user interactions with the button to help the user interact with the button properly and warn the user of action that is about to be taken.

Abstract: Aspects of the present invention enable a storage device (e.g., a recordable book, toy, computing device) to be controlled with a single control button that performs multiple functions. Different interactions with the button produce a different control input. In one aspect, the storage device is an audio recording device that can record, lock, unlock, transfer to a separate storage device, or play back one or more audio recordings. These five functions (i.e., recording, locking, unlocking, transferring, and playing back) are initiated or facilitated by depressing a single button located on the audio storage device for different lengths of time or in different patterns. Audio recordings may be played in response to user interactions with the button to help the user interact with the button properly and warn the user of action that is about to be taken.

Abstract: Embodiments provide a handheld fluorometer and method of determining a concentration of a product within a sample. In some cases the handheld fluorometer includes an immersible sensor head that measures a fluorescence of the product and a controller that calculates the concentration of product. In some cases the handheld fluorometer includes a handheld controller module, an immersible sensor head connected to the controller module, a sample cup for containing a water sample, and a fastener that removably fastens the sample cup about the immersible sensor head. In some cases the sensor head is angled with respect to the controller module and the fluorometer provides a substantially stable base. The sample cup can be removed to acquire a sample of water containing the product and then refastened about the sensor head for determining the concentration.

Abstract: Embodiments provide a handheld fluorometer and method of determining a concentration of a product within a sample. In some cases the handheld fluorometer includes an immersible sensor head that measures a fluorescence of the product and a controller that calculates the concentration of product. In some cases the handheld fluorometer includes a handheld controller module, an immersible sensor head connected to the controller module, a sample cup for containing a water sample, and a fastener that removably fastens the sample cup about the immersible sensor head. In some cases the sensor head is angled with respect to the controller module and the fluorometer provides a substantially stable base. The sample cup can be removed to acquire a sample of water containing the product and then refastened about the sensor head for determining the concentration.