We ordered the SD01 PRO Tank Marker…
We ordered the SD01 PRO Tank Marker lights to provide visibility and identification of our dive buddies on crowded night dives. The run time on these with a single alkaline AAA battery is phenomenal. I have left one on overnight and it was still flashing 24 hours later. I believe the actual run time is significantly longer. Use of dual o-rings will prevent flooding of the marker far better than other tank marker lights. I highly recommend these for divers.