The Compliance West USA CDT Calibration Box (CBX, SKU 00‑CDT‑CBX) is a rugged, USA‑built accessory designed to verify and calibrate the functionality of the CDT‑240 capacitor discharge tester. It provides two precision RC time‑constants (1 s and 0.1 s) and includes NIST traceable calibration, with optional A2LA accreditation.