HQ40d Portable pH, Conductivity, Dissolved Oxygen, ORP, and ISE ... - Hach
https://my.hach.com/hq40d-portable-ph-conductivity-dissolved-oxygen-orp-and-ise-multi-parameter-meter/product-details?id=59428349688
WEBHach's versatile HQ40d dual-input multi-parameter meter measures up to two parameters simultaneously: pH, Conductivity, or LDO (Luminescent HQ40d Portable pH, Conductivity, Dissolved Oxygen, ORP, and ISE Multi-Parameter Meter | Hach - Details - …
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