Coming soon from Campbell Scientific is the ST-21, a new Service Argos platform transmitter terminal (PTT). Polar orbiting satellites make the Argos system well suited for stations deployed in high latitudes. The new ST-21 consists of a Telonics electronics module, a voltage regulator, and an SDC communication interface—all housed in a rugged metal case. It has low power drain and a wide operating temperature range (-30º to +70ºC).