The ranges are average values and are exceeded by most current measuring instruments. A minimum distance of 32.8 ft (10 m) is required for some instruments. In order to guarantee accurate measurements with reflective targets the target angle should be a maximum of 30°. Survey markers with reflective targets are exclusively recommended for carrying out distance measurements using a tachymeter or total station. Survey markers with crosshairs, but without reflective targets, are available for the use of levelling instruments, theodolites and construction lasers.
- 220mm x 220mm (8.7-in x 8.7-in) target
- Range approximately 1640 ft (500m)
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