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do we have a TR81 replacement?

There is not direct replacement for the TR81:
 - if you want to upgrade to a CT5000 controller, then you can use the SRT-100 ibutton reader.
 - if you want to keep your CT500 or CT1000 controller, you can replace the TR81 with the TR84.
The TR84 is lexan and not metal and uses an 11 wire cable instead of a 3 wire cable like the TR81, but the TR84 will wire to the existing CT500 or CT1000 controllers.

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