Thermistor Kits are a grouping of NTC, PTC, or NTC & PTC thermistors that change their resistance?relative to changes in temperature. The kits come in through-hole, surface mount, eyelet, or probe styles,?with an assortment of values and pieces ranging from 6 (6 values – 1 each) to 5725 pieces (109 values – mixed quantities) with temperature ranges?from -55°C to 170°C.