Abstract: An apparatus for holding a corrosion-testing coupon within a processing system. The apparatus includes a flexible member having a first end and a second end, the first end of which is adapted for holding the apparatus within the processing system; and an electrically insulative member which is attached to the second end of the flexible member. The electrically insulative member is adapted to hold a corrosion-detecting coupon. Preferably, the flexible member is a flexible corrugated metallic conduit. The apparatus advantageously includes an attachment member, such as a shaft, which is connected to the first end of the flexible member and which is adapted to attach to the processing system; and a sleeve which connects the electrically insulative member to the flexible member.