USB Head FourWire Kelvin Clip Internal Resistance Tester Probe Precision and stability: Designed to accurately measure internal resistance and deliver stable data for critical assessments, using a fourwire Kelvin sensing approach to improve measurement accuracy. Durable construction: Crafted from durable materials with a sophisticated design that ensures longterm reliability and consistent performance across testing tasks. Suitable for professionals: Ideal for electronic engineers, battery manufacturers, and technicians who require precise battery internal resistance measurements. Core features and compatibility: Fourwire Kelvin sensor for accurate readings and reliable integration into standard internal resistance testing workflows; built to withstand routine lab and field use. Use scenarios: Battery production QC: monitor and control celltocell internal resistance to ensure production consistency. Field service and maintenance: diagnose degraded batteries and identify weak cells or bad connections. Research and development: compare battery performance across chemistries and pack designs to guide optimization.