Apogee Instruments’ Full-Spectrum Quantum Sensor is now available in two new amplified voltage outputs and a digital SDI-12 output for easy integration into systems that are not designed for millivolt signals. The sensors have been designed to have all the circuitry inside the head, the same as our un-amplified sensor (SQ-500), allowing them to remain rugged and waterproof. The amplified models include the SQ-512 with a 0-2.5 V output and the SQ-515 with a 0-5 V output. The SQ-521 is a digital sensor that uses SDI-12 communication protocol.