| 摘要 |
A reflective tape survey target with light emitting means at its centre, the light emitting means allows the target to be viewed in low light or dark conditions, without the need for an external light source. Preferably the target 1 has a central hole 2 and has a light source added to the back of the survey tape which can be a luminescent source 3, or an electronically powered device (4, fig 2) |
