Transmitters for humidity	Transmitters for trace humidity	Temperature probes
Transmitter for differential pressure	Compressed air meter	Process displays

Product Highlight:  Testo Temp-RH Transmitters

> Intelligent Transmitters Designed Right

The new testo 6651 Mid Level and testo 6681 High End Temperature-Humidity Transmitters are designed for the demanding requirements of  industry and critical HVAC...  maximum uptime,  easy installation & commissioning, and  easy service.   As a result, some industry-leading features are standard in both testo 6651 and 6681 Models.  First, a wide range of  interchangeable "Smart"  Probes allows plug and play simplicity in installation, commissioning, and routine service-calibration... even for duct mounted probes (an industry exclusive).   Second, a unique  "Early Warning System" (available with all probes) alerts the user to measurement problems (condensation or drift in 2-point adjustment) early enough to take proactive measures.   Third, an internal "log book" tracks and records all error and status messages for both servicing and auditing convenience.   And as a bonus,  testo P2A Software provides convenient  Parameter setting, Adjustment and Analysis of single or multiple transmitters with drag-and-drop simplicity.

> The Science of Humidity Measurement Begins with the Sensor

The testo 6651 and testo 6681 Transmitters are designed for the monitoring and control of critical climate and process environments.  These demanding humidity measurements confidently rely on the advanced Testo Humidity Sensor with tested and proven long-term stability.   Testo manufactures its own humidity sensors, so you are assured of  accurate, repeatable, and stable performance over time. 

> Application-Specific Probes with Advanced Designs

The accurate and dependable Testo humidity sensor also allows some unique and special application probe designs as well, each one interchangeable.  High humidity, trace humidity (temperature dew point) and humdty in hydrogen peroxide (H₂O₂) sterilizing atmospheres are all available with plug-and-play convenience.

> The First Profibus DP interface

The testo 6681 offers a unique solution in the task of automating facility climate control:  a field-installable optional Profibus DP  module for the direct integration of all readings and messages into the Profibus factory automation network.