As stated, a kiln setter is not adequate for glasswork annealing. One can purchase a new controller or build your own. Using a PID controller such as the Fuji PXR-3, in combination with a SSR, would be a choice for this application. It all depends if you desire to purchase or build.
Some folks have converted a Skutt 609 kiln and now can ramp the temperature up, down or hold. In general, a PID controller can hold a temperature in the rage of plus or minus one degree once properly setup. More than adequate for glassworking purposes.
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