Control meter for controlling the supply of services, in particular the supply of electric energy, having a support base, anchored with which is a main power supply line, and a metering group detachable from the support base and with a measurement apparatus interposed between the main power supply line and a subscriber line. A safety anchorage is provided for preventing fraudulent manipulations at the control meter and comprises mechanical means associated with the metering group and movable into a locking position for engagement with the support base when the metering group is mounted on the support base, and an interrupter for generating an activation signal upon activation by the mechanical means, wherein the mechanical means is arranged to activate the interrupter when the mechanical means is released from the locking position for detaching the metering group from the support base. The invention allows to positively obstruct acts of fraud and thus to provide a control meter which is able to permit the remote-control of the "open/closed" state in situations of fraud or rather attempted fraud and is capable of unequivocally proving the occurrence of fraud or attempted fraud.