Check the listing for details. iManifold Wireless Temperature phsychromter Probe for HVAC Refrigeration 911m. Color: Black, White, Condition: Used. Listed at 50.00 USD. They are Sold each and does not include all 6. If want all 6 have to pay for 6. Imanifold phsychromter probe 911m. These are zigbee wireless mesh probes that connect to either the Imanifold Guage 900m or to the Imanifold icconnect hub 900c. Imanifold tools use zigbee mesh network that is far superior to just Bluetooth probes as they can have almost endless range as all probes are also repeaters over very long range zigbee mesh. Then the Guage or the hub transmits the data to the Imanifold app on your phone over Bluetooth. All work great and capture humidity and temperature, wet bulb, with 2 additional inputs on side of probe so could also plug in 2 additional Cooper Atkins probes and transmit more Temps to the app also.