Surveying system, having: ▪ a laser measuring instrument, which has a laser measuring device with a search beam and a measuring beam, a control device for creating and evaluating a differential image and a camera device, ▪ a first target object (12; 20; 40), which has a first reflector device (21.1) with at least one first reflector element for reflecting the measuring beam, a first receiving device (23.1; 43.1) with at least one first receiving element for receiving the search beam, a first transmitting device (25.1; 44.1) with at least one first transmitting element (31, 32, 33; 45, 46, 47, 48) and a first control device (26.1) with a first evaluating element (27.1) for evaluating the search beam received and a first controlling element (28.1) for controlling the receiving and transmitting devices (23.1, 25.1; 43.1, 45.1), and ▪ a second target object (13; 20; 40), which has a second reflector device (21.2) with at least one second reflector element (22.2) for reflecting the measuring beam, a second receiving device (23.2; 43.2) with at least one second receiving element for receiving the search beam, a second transmitting device (25.2; 44.2) with at least one second transmitting element (31, 32, 33; 45, 46, 47, 48) and a second control device (26.2) with a second evaluating element (27.2) for evaluating the search beam received and a second controlling element (28.2) for controlling the receiving and transmitting devices (23.1, 25.1; 43.1,45.1), in which the first and second transmitting devices (25; 44) are made to each transmit a first and second visible transmission beam (34, 35; 51, 52, 53, 54), in which the light colour of the first visible transmission beam (34; 51, 52, 53, 54) is different from the light colour of the second visible transmission beam (35; 51, 52, 53, 54). ▪ a laser measuring instrument, which has a laser measuring device with a search beam and a measuring beam, a control device for creating and evaluating a differential image and a camera device, ▪ a first target object (12; 20; 40), which has a first reflector device (21.1) with at least one first reflector element for reflecting the measuring beam, a first receiving device (23.1; 43.1) with at least one first receiving element for receiving the search beam, a first transmitting device (25.1; 44.1) with at least one first transmitting element (31, 32, 33; 45, 46, 47, 48) and a first control device (26.1) with a first evaluating element (27.1) for evaluating the search beam received and a first controlling element (28.1) for controlling the receiving and transmitting devices (23.1, 25.1; 43.1, 45.1), and ▪ a second target object (13; 20; 40), which has a second reflector device (21.2) with at least one second reflector element (22.2) for reflecting the measuring beam, a second receiving device (23.2; 43.2) with at least one second receiving element for receiving the search beam, a second transmitting device (25.2; 44.2) with at least one second transmitting element (31, 32, 33; 45, 46, 47, 48) and a second control device (26.2) with a second evaluating element (27.2) for evaluating the search beam received and a second controlling element (28.2) for controlling the receiving and transmitting devices (23.1, 25.1; 43.1,45.1),