is this a single phase or 3- phase electrical wiring?

It is single phase.

will this unit reach 450°C in 5 minutes?

It will not. We generally advise to allow approximately 25 minutes to reach the operating temperature.

Is this oven American made? Item No.: EE3390010 - Thermolyne Benchtop Muffle Furnace

This product is manufactured in the Weaverville, NC, USA.

Does this furnace have a shelf?

The muffle furnace does not have a shelf.

how many dishes can fit in the furnace at once?

The total number of dishes that will fit inside the oven will depend on the size of the dish and if stacking is appropriate and/or possible. The interior chamber is 7 inches by 10 inches. This surface will accommodate 6 pans holding our 47 mm ProWeigh filters.

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