User-replaceable dissolved oxygen sensors for the YSI Pro Series and ProQuatro handhelds.
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2002 Galvanic DO Sensor — no warm-up required, start sampling immediately
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2003 Polarographic DO Sensor — longer sensor life, lower overall cost of ownership (requires brief warm-up)
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2003B Polarographic DO Sensor — with 2.0 mil PE Blue membrane kit
Compatible with: ProQuatro, Pro20, Pro20i, Pro1020, Pro2030 instruments.