Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signaling, checking/supervision, life-saving and teaching apparatus and instruments, namely, temperature, weight, oil pressure, pressure, gas level, fuel control, speed, distance, angle, moisture, weight, voltage, light, visibility, moisture, time, rotary speed, salt levels and fuel level measurement equipment based on sensors; apparatus and instruments for conducting, distributing, transforming, acc...