Calibration Reference Standard 1955-2026 (差別化: 計測標準器軸)。Standard Hierarchy: Primary Standard (Atomic Cs/Rb/Atomic Clock・絶対基準)→Secondary (Working Standard・Lab定期校正)→Working Standard (Field使用器+定期校正)・SI Unit 7基本単位 1960→2019改訂 (秒second Cs-133・メーターm Speed of Light c+Planck h・kg Planck Constant・A Ampere Elementary Charge e+ Kelvin Boltzmann kB+ mol Avogadro NA+ cd Luminous Efficacy Kcd)・Cesium Atomic Clock CSAC: Cs-133 9,192,631,770Hz (1秒定義 1967・NIST F1 1999+F2 2014+UTC NIST-F4 2023+CIPM)・Rubidium Standard 6,834,682,610Hz (Atomic 携帯型・Lab定期・Microsemi+Stanford Research+Quartzlock+IQD Frequency Products+Microchip)・Hydrogen Maser (Microsemi MHM-2010+Symmetricom・水素メーザー)・Optical Atomic Clock次世代 (Strontium 87Sr+Ytterbium 171Yb+Aluminum Al+ Quantum Logic 10⁻¹⁹精度・NIST+JILA+RIKEN・SI redefinition候補2030+)・Voltage Reference: Josephson Junction Array (Volt Standard 99.99Hz Microwave→DC Voltage Step・Primary)+Bandgap Reference (LM399 6.95V±10ppm/year Industrial Reference・Linear Tech LTZ1000 0.05ppm/year最高峰)・Resistance Standard QHE Quantum Hall Effect 25812.807 Ohm (NIST Primary)+Standard Resistor Vishay Foil VHP+VRP・Capacitance: Andeen-Hagerling AH 2700A 0.4ppm Cap Bridge・Frequency Counter 12-digit Keysight 53230A+Symmetricom+Microsemi・GPSDO GPS Disciplined Oscillator (GPS+ Rubidium/OCXO Hybrid・Cost効率Lab・Trimble+Microsemi+Jackson Labs)・NIST National Institute Standards and Technology USA・PTB Germany+NPL UK+NIM China+METAS Switzerland+NMIJ AIST 国内産業技術総合研究所・Calibration Lab: ISO/IEC 17025 Accredited+JCSS 国内・¥¥¥¥¥¥-¥¥¥¥¥¥¥¥¥/Cesium Clock $50K-$500K・GPSDO $1K-$10K・Voltage Reference LTZ1000 $500、2026年NIST F4+Optical Clock+JD Quantum+Rubidium+GPSDO主流・SI 2019改訂後校正Service拡大。