111 Series, small glass bead with axial leads, 100,000 Ohm resistance, ±25.0% tolerance, 25/85 BETA = 3984 111 Series Thermistors are hermetically sealed in glass. They feature relatively uniform size, offer fast time response and are highly sensitive to electric power. They are often suited for use in low heat capacity applications and their micro size allows them to be used in extremely small assemblies such as catheters and hypodermic needles.