RKI Instruments ESM-23DH-GEH4 Germaine 0-0.8 ppm Sensor Ozone (O3) 0-5 ppm monitor The 3M™ PELTOR™ Brand is

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RKI Instruments ESM-23DH-GEH4 Germaine 0-0.8 ppm Sensor Ozone (O3) 0-5 ppm monitor The 3M™ PELTOR™ Brand isRKI Instruments ESM 23DH GEH4 $451. 97 No State or Local Sales Tax Anywhere! Germaine 0 0. 8 ppm Sensor Portable Replacement Sensor The RKI Instruments ESM 23DH GEH4 is a specific electrochemical sensor designed to detect Germane (GeH4) gas within a low range of 0 to 0. 8 parts per million (ppm), used as a replacement or spare part in various RKI portable gas detectors like the GD K88Ai, GD K71D, GD K77D, and SC 8000 models for sensitive trace gas