Leica Builder T User Manual page 219

Characteristics
Laser dot size
Technical Data
Measuring system:
Type:
Carrier wave:
Distance [m]
at 20
at 50
at 250
System analyser basis 100 MHz - 150 MHz
Coaxial, visible red laser class 1
660 nm
Laser dot size, approximately [mm]
10 x 12
13 x 21
38 X 85
Builder 219