The digits according to degrees you can learn from the instruction that came with the stove. If this is not available, try to find out the model of your stove. Carefully inspect it. Search for her name or marking. If you learn the necessary information, you can find the manual on the manufacturer's website or chat with other owners of such plates via the Internet. Perhaps they still have documentation for this model plate.
Buy a special thermometer made of stainless steel. You can find a special thermometer for the oven. If the stores in your city this device is not for sale, look for its stores through the Internet. You can pick up a thermometer for the price and design that will look seamless on the oven. Such thermometers are made of stainless steel.
Determine the degree with ordinary baking flour. Enough to take a little pinch of this product. Put into the oven on a baking sheet a white sheet of paper. Oven should be warmed up. Put on paper a little flour and observe her condition for a few seconds. Rapid charring of the flour means that the temperature in the oven corresponds to 270-280 degrees. Quick change yellow flour on dark brown means that the oven warmed up to 220-240 degrees. If the flour slowly acquired a shade of yellow, the oven temperature is not above 180-200 degrees.
Also check the temperature of your oven, you can use white sugar. Sprinkle a teaspoon of sugar on the foil to form a small hill. Foil should be laid on a baking sheet in a hot oven. Slowly increase the oven temperature using the slider. If you notice that the sugar started to melt, unable to stop turning the knob. The oven temperature at this point is 200 degrees. This temperature is enough to bake most dishes.