REEF KINETICS - REEFBOT REPLACEMENT NEEDLES (SET OF 10) Reef Kinetics Sale! from 2000 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. ReefBot 10 pack of Replacement Needles It is recommended that to change out the needles every 50 tests or whenever needed. Certified replacement needles for the ReefBot by Reef Kinetics.