Ametherm data sheets contain a table or matrix of resistance ratios versus temperature for each of the NTC Thermistor products. Coefficients α and β are also provided for particular equations to help the user or designer to translate resistance tolerance in terms of accuracy in temperature, as well as calculate the temperature coefficient for each curve. There is quite a wide range of materials that can be used to manufacture thermistors, but there are limitations involved depending on the size, operating and storage temperature range and nominal resistance values.