BB 660/25.5 is the Standard Platinum Resistance Thermometer jointly developed with National Institute of Advanced Industrial Science and Technology (AIST/NMIJ) as an interpolation device for measurements from -190⁰C to approximately +660⁰C.

Employing a sensing element with a single helix coil structure (Japan Pat. No.3380523) provides superior stability at high temperature and high resistance to vibration. It can also provide smaller self-heating temperature rise and high response.

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