The Elcometer Copper Sulphate Half-Cell Probe measures rebar corrosion potential. This Probe is interchangeable with the Search Heads and is a sealed unit, so there is no need for mixing chemicals on-site. The Copper Sulfate Half-Cell Probe kit includes a 5.5ft (1.7m) rebar connecting cable with clip and an 80ft (25m) extension cable on a spool. The Half-Cell kits are guaranteed for five years. You can find all of the concrete testing equipment you need at Certified MTP and pick up the right rebar locator for your Copper Sulphate Half-Cell Probe!