The HM-3 Hyper Metal replaced the HM-2, 1993. Until the release of the MD-2, 2001, the HM-3 was the distortion pedal with the highest gain. The controls are the same as on the HM-2, and the design goals remained unchanged; create a powerful hard-edged sound with powerful sustain with more accurate dynamic response. The MT-2 Metal Zone had been released 2 years earlier and the HM-3 never managed to get out of the MT-2s shadow and was discontinued 1999.

Specifications
Controls: Level, Color Mix (Low, High), Dist
Connectors: Input, Output, AC Adaptor
Current Draw: 12 mA (DC 9V)
Recommended AC Adaptor: PSA Series

Labels
Silver – Made In Taiwan
The HM-3 was sold from April 1993 to December 1998.

http://www.bossarea.com/boss-hm-3-hyper-metal/