HQ40D Portable pH & Biochemical Oxygen Demand (BOD) Meter, Laboratory Kit for Water Quality, with Refill pH Electrode, Luminescent DO Sensor and BOD Bottles, 1 m Cable | Hach - Overview - Obsolete
HQ40d Portable Meter Kit with PHC101 pH Electrode and CDC401 Conductivity Cell | Hach India - Overview - Obsolete
![Portable multimeter (Fluorescent dissolved oxygen, etc.) HQ40d/HQ30d | Portable analyzers | Our Products | DKK-TOA CORPORATION Portable multimeter (Fluorescent dissolved oxygen, etc.) HQ40d/HQ30d | Portable analyzers | Our Products | DKK-TOA CORPORATION](https://www.toadkk.com/english/product/details/por/dlcg5r0000000m8o-img/HQ40d.jpg)