A lockout device includes a body, a clamp, and a cover. The silicon substrate contains multiple diffusing bodies diffusing incident light in all directions as shown by arrows. The early failure of the bit tip due to the premature wear of the bit body is overcome; and the lifetime of the bit is increased 2 to 3-fold with respect to that of a conventional bit. In testing and tuning, a comparison is made to indicate whether the antenna is too short or too long. The input stage comprises a resistor network coupled between a pair of input nodes and a power line and comprising a common resistor, a pair of load resistors and a shunt resistor.