510 Series Meters – Extech Instruments 

Extech Instruments has launched new environmental meters optimized for HVACR and IAQ professionals. The series includes an airflow meter, a combination hygro-thermometer and psychrometer, and a 10-in-1 multifunction meter. READ MORE HERE Source: 510 Series Meters – Extech Instruments | 2017-11-27 | Engineered Systems Magazine