Testo 6621 RH & Temperature Transmitter

The Testo 6621 Humidity Transmitter is a highly accurate sensor with long-term stability (±2.0% RH). The 6621 has attractive housing that blends into any environment. Duct mount or wall mount version are available. The 6621 is provided with a display and an external probe as options. The sensors and the analog outputs can be adjusted, analyzed and parameterized via the external interface using the P2A software. The 6621 is a high-performance transmitter for a low price. It meets the increasing requirements in automated building services in terms of accuracy, reliability and safety and thereby saves energy costs.