The FoSmeter accurately measures the magnetic field strength of an induction loop system.  It is calibrated at manufacture for accuracy and linearity using a calibrated magnetic field.  Ten LEDs are set out in 3dB increments to indicate magnetic field strength relative to 100mA/m (indicated as 0dB).

The AHHM/H also features gain and filter sensitivity switches, and includes a headphone input to allow the user to test the sound quality of the system (headphones not supplied). 

Also available (see Shopping Basket below):
AHHM Magnetic Field Strength Meter (without Loop Tester)

Both the AHHM and the AHHM/H use a 9V PP3-type battery** (not supplied). 

**Customers please note that not all 9V batteries for sale are the same size.  This means that some makes are too deep to allow the battery compartment cover to close properly - for example, Duracell Plus and Duracell Ultra.  Please check and use a suitable battery make with either the AHHM or AHHM/H.