The Yoma Ring is  probably the  most  important  item that has
    been  handed  down  through  generations  of the  Mano family,
    and  has  been   worn   since  the  time  of  the   very   first  devil
    hunter:   Haruka.   Although  not   specifically   said,   it   is   sort
    of   implied   that   in   order   for   Yohko  to   actually   transform
    into  her  devil  outfit  she  needs  to  be  wearing  the  ring.  The
    ring  actually  contains  with in it some  bindings  of the  demon
    Tokima's  power.  Tokima   is  the  most   powerful   of  demons,
    and  has   the  power to  manipulate  time  and  space.  Most  of
    Tokima's power is sealed within a clock in the Mano household,
    and  the  rest  Tokima still  has.  The ring  however has a  small
     portion  also,  mainly  being the power to  manipulate time.  The
    Yoma ring also seems sensitive to other super natural
    phenomena.

    The  other  most  important  item  in the  devil hunter  inventory  is the
    Soul   Sword.   Although   also   in   use   since   the   very   first   devil
    hunter,  the  Soul Sword  isn't   exactly  a  material  thing.  As  Modoka
    tells  Yohko; "Call  within  all  that  is  good  within   you, and  you  can
    summon the sword of your soul".  Yohko typically transforms into her
    outfit  first, and  then calls  upon the soul  sword.   It  also seems very
    likely  that there  is some  sort of  connection between the Yoma Ring
    and the Soul Sword. The sword also has the  ability to disengage the
    hilt  from  the  blade,  after  which  the remainder  can  be  used  like a
    short  ax.  Devil  Hunters  also  have  the ability  to  recall  the  blade to
    their  hand  should  they  drop  or  become  separated from the sword.
    It  doesn't  seem  like  the  sword  is  a  requirement  for  being a  devil
     hunter,  although  each devil  hunter  in the  Mano line  seams  to have
    one.  Madoka  certainly  doesn't  seem at a disadvantage  without one,
    but  then  again  Madoka  could probably kick  ass  with just  a pointed
    stick...

    One  thing  that  makes Yohko  rather noticeable, is  her  unusual
    hair style.  Although  it doesn't  seem special  in any way, Yohko's
    hair  ornaments  actually  do  contribute  to  Yohko's  power.   The
    ornaments are made from stones known as "Shimi Seki".  These 
    stones  have  a  natural  attraction  to  each  other, and  often glow
    when  near another  stone of it's type.  It  is said that these stones
    are  the symbol of  eternal love.  The  stones also have  the ability
    to  focus and  amplify the power of those who use them.  It is said
    that devil  hunters have used them for generations.  Yohko's  hair
    ornaments are made of Shimi Seki, although  it doesn't seem as 
    though Yohko was aware of their power.

    In order to  become a devil hunter  you have to have  the right equipment.
    While Yohko has  the traditional items of the Mano families devil hunters,
    these items are not necessarily  unique.  In order for Azusa to become a
    devil  hunter,  she has  a few  items of  her own.  Azusa has her own ring
    which  differs from  Yohko's  quite a bit.  While  it seems  similar in much
    of the  engravings, Azusa's  ring nearly  covers the entire  backside of her
    hand.  Azusa's  other item is  the Spear of Fuma.  In much the same way
    that  Yohko can  call the  Soul Sword,  Azusa can  call the Spear of Fuma.
    The  spear doesn't  seem to  really have  any special  attributes, but then
    again Azusa is rather inexperienced and isn't exactly a master at using it.
    Azusa  can also  retrieve the  spear telekineticly (like  Yohko can with her
    sword)  if she  becomes separated  from it.  It  seems  however, that she
    only  had this ability when possessed by Tokima, and probably hasn't yet
    learned this ability on her own.