![]() The device is known to be used in Brazil, Britain, Canada, China, Czech Republic, Hong Kong, New Zealand, Norway, Slovak Republic, Spain, and the United States. Significant suppliers of PPG machines include Behavioral Technology Inc. The circumferential type is more common, but the volumetric method is believed to be more accurate at low arousal levels. This uses a mercury-in-rubber or indium/gallium-in-rubber ring or electromechanical strain gauge and is placed around the shaft of the subject's penis to measure changes in circumference. When this is placed over the subject's penis, as tumescence increases, the air displaced is measured. There are two types of penile plethysmograph:
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