Supplied with every single crystal probe, the knurled ring holds the membrane in place.
The membrane key is used to unscrew and screw in the locking ring which the membrane is fitted into.
Available as spares the part numbers are as follows:
Knurled Ring Assembly for 19 mm (3/4″) Probes 001-3705
Knurled Ring Assembly for 13 mm (1/2″) INOX Probes 001-3709
Knurled Ring Assembly for 13 mm (1/2″) Probes 001-3704
Knurled Ring Assembly for 6 mm (1/4″) Probes 001-3703
Membrane Key for 19 mm (3/4″) Probes 001-2610
Membrane Key for 13 mm (1/2″) Probes 001-2611
Membrane Key for 6 mm (1/4″) Probes 001-2612
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