HR SERIES ULTRA-PRECISION RESISTORS Axial lead wire wound ultra precision epoxy encased enclosed shell with tolerances from 0.01% to 0.005% & TCRs from Std. 5PPM to 1PPM & ohmic values from 0.1Ω to 10MΩ in a wide variety of physical sizes & AWG gauge pure copper leads. Temp. Span from -65°C. to +125°C. & +/- 0.001%/year stability.