Computations and testing of experimental models of a signaling indicator have shown that its indicator has a precision class of 1.5 over a scale with δt=150‡C at an ambient temperature of 20±10‡C, provided that the bridge and the setter have a precision class of 0.1 and the microammeter of 1.0. The error of the signaling device does not depend on that of the indicator and does not exceed 1‡C for ambient temperatures of ±60‡C. When microammeters, for instance of type M109 class 0.5, are used as secondary instruments, the precision of the indicator with a scale of 150‡C corresponds to class 1.0 taking into consideration all the remaining provisos. The above parameters of the signaling indicator show that it can easily compete not only with ratiometer, but also with differential signaling indicators, for instance of the DPR-0.1 type, which have a self-balancing bridge,i.e., of the MPR-12T type. The advantages of the above signaling indicator are particularly noticeable when it is necessary to test the efficiency of thermal systems regulated by a signaling device. In such a case the temperature indicator can be of class 2.5–4.0, i.e., it is possible to use a microammeter without altering its scale. This signaling indicator has a considerably higher reliability under field operating conditions than instruments with mechanical or photoelectric systems. As a comparison, let us note that instrument M4041 made by the Japanese firm of Khokusin, and equipped with class 0.5 pointer indicator instrument and an electromagnetic signaling device, provides over a scale of 0–300‡C a reading and signaling error of ±1%.