2  Electronic Balancing Tool EBT720/EBT721 and ProHood PH720/PH721 
The basic EBT721/PH721 contains all of the EBT720/PH720 components plus 2 ft × 2 ft (610 mm × 610 
mm) air capture hood, frame, and base. A variety of optional tools (see below) are also available to meet 
your measurement needs. 
 
The following paragraphs provide brief descriptions of the micromanometer and the various standard and 
optional tools for use with the EBT/PH. Refer to Chapters 3
 and 4 for more detailed information on using 
the micromanometer and taking measurements with various sensors and probes. 
Micromanometer 
Figures 1 and 2 show the features of the micromanometer used in the EBT720/EBT721 and 
PH720/PH721.  
 
 
Figure 1:  Features of the EBT720/EBT721 and PH720/PH721 Micromanometer, Front View 
 
 
 
Figure 2:  Features of the EBT720/EBT721 and PH720/PH721 Micromanometer, Back View 
Display 
Keypad 
AC Adapter 
Connection 
RS232 Port 
For Future Use 
Probe Connector 
Headphone 
Connection 
Battery 
Compartment 
Airflow 
Inlet/Outlet