1 Required Item Aqua Troll 500 Aqua TROLL 500, Non-Vented 0-100m Part #0050750 49364 - Sample Preparation Systems, Laboratory 2.00 Each 2 Required Item Aqua TROLL RDO Sensor Aqua TROLL RDO Sensor (includes RDO-X Cap) Part #0063450 49364 - Sample Preparation Systems, Laboratory 4.00 Each 3 Required Item Aqua TROLL Temperature/Conductivity Sens Aqua TROLL Temperature/Conductivity Sensor Part #0063460 49364 - Sample Preparation Systems, Laboratory 4.00 Each 4 Required Item Aqua TROLL pH/ORP Sensor Aqua TROLL pH/ORP Sensor Part #0063470 49364 - Sample Preparation Systems, Laboratory 4.00 Each 5 Required Item Rugged Twist-Lock Cable < p>Rugged Twist-Lock Cable/Non-Vented Poly/Twist-Lock/No Adapter/No Reel< /p> Part #0052000 49364 - Sample Preparation Systems, Laboratory 2.00 Each