Trimble unidirectional target ID emits a unique LED signal (8 channel options) so the total station will only lock on the correct target, allowing multiple instruments and / or targets to work on the same site.Works with S3 S6 S8 SPS610 SPS710 SPS630 SPS730 SPS930 RTS555 RTS633 RTS655 robotic total stations. (We deduce this from the Trimble info available on the web)

This is really clean, no battery bleed inside (dang, shoulda taken a pic of the battery compartment...it\'s perfect) and it includes the height adapter which doubles as a short staking point. Works with the standard Trimble S6-type prism and runs on two AA batteries. New batteries included.

It looks like typical pricing has been $249 for these so I figure this one has to be worth that, because it\'s perfect.

$7.50 shipping to the US 48, +$3 to AK / HI, and international via USPS Int\'l Priority ($45 most countries, check the calculator)

Happy offerding!