The 198 155 401 is a GF Signet 9-digit spare-part code, most likely a service kit/component for the 3‑2551 insertion magmeter family (PP/316L or PVDF/Ti variants) — possibly an electrode, grounding ring, or insertion accessory pack.

Compatible with 2551‑P0/P1/P2/T0/T1 blind/display magmeters, NEMA 4X, 20 µS/cm min. conductivity.

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