Telemeters; Surveying instruments; Smoke alarm tester in the nature of a cool burning smoke generator; Radiation-measuring instruments; Measuring apparatus for temperature and humidity levels in gases and solid substances; Instruments for measuring length; Gas appliance alarm timer for detecting and alerting the presence of gas flow after a prescribed period of time; Electronic sensors for measuring solar radiation; Decorative covers for smoke detectors; Alarms for the detection of inflammabl...