A dual-use level and temperature probe includes a stem configured to contact liquid, at least one sensor coupled to the stem, and a controller in signal communication with the sensor. The sensor includes an input terminal configured to receive electrical current and an output terminal configured to provide a return path for the electrical current. The controller is configured to deliver the input current to the input terminal and configured to monitor a voltage across the input and output terminals. The controller is configured to perform both a liquid level measurement and a temperature measurement based on the voltage.

A fluorescing marker is used in order to mark (for example) a leaf of a multi-leaf collimator and/or the reference points within the field of view. The markers are illuminated with light tuned to cause the markers to fluoresce at a wavelength different to that of the illuminating light. The fluorescence is then detected by a camera. This method allows the image to be captured by the camera with increased contrast. Accordingly, the present invention provides a multi-leaf collimator for a radiotherapeutic apparatus, comprising at least one leaf having a fluorescent marker. The fluorescent marker will usually emit light of a wavelength longer than the incident light, allowing suitable filters to be provided in order to distinguish the light emitted by the markers. A suitable material for use in the fluorescent markers is ruby. The present invention also provides a radiotherapeutic apparatus comprising a multi-leaf collimator as defined above, and a camera arranged to view the fluorescent markers. A source of illumination for the fluorescent markers is ideally monochromatic, or nearly so. The camera can have a filter arranged to substantially prevent light of the wavelength emitted by the source of illumination from entering the camera, thereby improving the contrast of the image. The radiotherapeutic apparatus can also comprise a source of illumination that is optically co-located with a radiation source, to allow the radiation field that will be emitted to be checked visually by an operator. The co-located source is preferably substantially monochromatic, emitting substantially no light at the wavelength of the fluorescent markers. A filter can then be placed over an output of the radiotherapeutic apparatus, for blocking light of the wavelength of the fluorescent markers and thereby enhancing the contrast of the image that is taken of the fluorescent markers.

A food temperature measuring device includes a device main body, a signal control module, a temperature measuring module, a light emitting display module, and an information display module. The temperature measuring module is configured for measuring a predetermined food so as to obtain measured temperature information of the predetermined food. The light emitting display module includes a first light emitting unit for providing a first food light message, a second light emitting unit for providing a second food light message, and a third light emitting unit for providing a third food light message. The information display module is configured for displaying a measured temperature value of the measured temperature information obtained by the temperature measuring module. Therefore, the light emitting display module can be configured for providing food category corresponding information corresponding to the predetermined food according to the first, the second, and the third food light message.

An apparatus for indicating temperature of a liquid inside a bottle, the apparatus including: a housing having an upper surface configured to support a bottle; a base surface configured to rest on a flat structure; a non-contact thermometer located inside the housing; one or more indicators to display or provide an indication of a temperature state of the bottle; and a processor; wherein the non-contact thermometer senses temperature of a bottle placed on the upper surface of the housing and sends signals relating to the temperature to the processor, wherein the processor is configured to provide an indication via the one or more indicators alert a user if there is an increase in temperature state of the bottle.