The GRAPHTEC B-530 is a capacitive humidity sensor supplied with a 3 m signal cable and power plug.
Officially listed for GL7000 with GL7-M, GL2000, GL980, GL860, GL840, GL260 and GL240. Some loggers permit only one connected B-530.
Confirm the exact logger model, connection type and required quantity with RCCE before ordering.
Checked against the official GRAPHTEC supplies and logger specification pages.