IETLAB HARS-LX Series Decade Resistance Substituter Lab Standard (20 ppm; từ 1 mΩ đến 121.1 MΩ)

(Full specifications can be found on datasheet)

High accuracy - as good as 20 ppm
High stability - as good as 5 ppm/yr
Over 55 models available with resistance from 1 mΩ to 121.1 MΩ
Resolution as good 1 mΩ with a fixed decade or 20 μΩ with a rheostat.
Low temperature coefficient - as low as 3 ppm/°C
High performance silver-clad contacts
Hermetically sealed, low inductance resistors
No zero correction required
For increased accuracy, decades ≥ 1 Ω can be individually trimmed
The US Army's Resistance Standard

Datasheet