Techniques are provided for implementing a system that can perform a range estimation of a target object at power levels both below and above an pre-defined power threshold. In embodiments, the system first performs a lower-power measurement, which may be sufficient to estimate the range to the object. If the low-power measurement is unsuccessful, the system then performs a fault check to ensure proper operation of the device. If the fault check is passed, the system may then perform a high-power measurement of the range to the object. Results may be provided to a user by a visual display.