YSI Truline 400403 Combination Cyanide Electrode, BNC Connector, 1m Cable. TruLine combination cyanide electrode, BNC connector, 1m cable. The TruLine series of laboratory ISEs consists of 15 electrodes that have an integrated reference, eliminating the need to have a separate reference half-cell. Each TruLine ISE has a refillable double-junction reference, resulting in a long electrode life and exceptional measurement reliability. TruLine ISEs can be connected to any ISE instrument featuring BNC connection, including the YSI 1320. Reference/electrode fill solution, ionic strength adjustor, and small bottle of standard are included with each ISE.