A computer system for detecting a gas leak, the computer system comprising: communications circuitry configured to receive, from a user device, an electronic indication of a monitoring mode for an ultrasonic gas leak detection device ; monitoring mode determination circuitry configured to determine whether the monitoring mode corresponds to a standard mode or a focus mode; ultrasonic gas leak monitoring circuitry configured to in response to a first determination that the monitoring mode corresponds to the standard mode, monitor a first range of ultrasonic frequencies to generate a first set of monitored data , wherein the first range of ultrasonic frequencies is from about 20 kHz to about 30 kHz, and in response to a second determination that the monitoring mode corresponds to the focus mode, monitor a second range of ultrasonic frequencies to generate a second set of monitored data , wherein the second range of ultrasonic frequencies is from about 50 kHz to about 70 kHz; and ultrasonic gas leak detection circuitry configured to in response to the first determination that the monitoring mode corresponds to the standard mode, generate a first ultrasonic gas leak detection signal based on the first set of monitored data , and in response to the second determination that the monitoring mode corresponds to the focus mode, generate a second ultrasonic gas leak detection signal based on the second set of monitored data . communications circuitry configured to receive, from a user device, an electronic indication of a monitoring mode for an ultrasonic gas leak detection device ; monitoring mode determination circuitry configured to determine whether the monitoring mode corresponds to a standard mode or a focus mode; ultrasonic gas leak monitoring circuitry configured to in response to a first determination that the monitoring mode corresponds to the standard mode, monitor a first range of ultrasonic frequencies to generate a first set of monitored data , wherein the first range of ultrasonic frequencies is from about 20 kHz to about 30 kHz, and in response to a second determination that the monitoring mode corresponds to the focus mode, monitor a second range of ultrasonic frequencies to generate a second set of monitored data , wherein the second range of ultrasonic frequencies is from about 50 kHz to about 70 kHz; and in response to a first determination that the monitoring mode corresponds to the standard mode, monitor a first range of ultrasonic frequencies to generate a first set of monitored data , wherein the first range of ultrasonic frequencies is from about 20 kHz to about 30 kHz, and in response to a second determination that the monitoring mode corresponds to the focus mode, monitor a second range of ultrasonic frequencies to generate a second set of monitored data , wherein the second range of ultrasonic frequencies is from about 50 kHz to about 70 kHz; and ultrasonic gas leak detection circuitry configured to in response to the first determination that the monitoring mode corresponds to the standard mode, generate a first ultrasonic gas leak detection signal based on the first set of monitored data , and in response to the second determination that the monitoring mode corresponds to the focus mode, generate a second ultrasonic gas leak detection signal based on the second set of monitored data . in response to the first determination that the monitoring mode corresponds to the standard mode, generate a first ultrasonic gas leak detection signal based on the first set of monitored data , and in response to the second determination that the monitoring mode corresponds to the focus mode, generate a second ultrasonic gas leak detection signal based on the second set of monitored data . <EOS>