Abstract: A wireless access control system. In some embodiments, the system includes: a switch; a plurality of wireless access points coupled to the switch and including a first wireless access point including a first wireless transceiver and a second wireless access point including a second wireless transceiver, the first wireless transceiver adapted to define a first coverage area, and the second wireless transceiver adapted to define a second coverage area; and a wireless device located within the second coverage area and having an identity code adapted to uniquely and wirelessly identify the wireless device to the plurality of wireless access points. The wireless device rates the quality of the connection to the access control computer system and the wireless access points and downloads access control information from the first or second wireless access point based on the connection quality ratings.

Abstract: A spirit level having a measuring stick slidably mounted on one end of the level with means attached to the level for clamping and releasing the free transverse movement of said measuring stick from a position near the center of the level. A separate bracket is provided for attachment to the level for the clamping means which bracket also may include guide means for the measuring stick. The clamping means comprises a spring urged frictional brake which engages the measuring stick and is releasable by a thumb operated handle slidably mounted adjacent the vial which indicates when the level is level. This guiding bracket may be longitudinally extended with respect to the level to increase the length thereof.