At the heart of Hydrolab’s water quality sondes is our superior sensor technology. Hydrolab offers the most complete selection of sensors available on any multi-parameter sonde.

Advanced sensor designs and technologies give you high-quality data that you can trust. Hydrolab’s sensors are the key to the value we provide – reliable data, long life, and simple maintenance result in the lowest possible operating costs for you. In addition, all of these features are backed by our sensor warranties, which are the best in the industry.

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Hach LDO Luminescent dissolved oxygen technology has no membranes to maintain, and ensures that calibrations last longer than ever before without drift.	Conductivity Uses four graphite electrodes in an open cell design to provide extremely accurate and reliable data with virtually no maintenance	pH Uses glass bulb and refillable reference electrode for reliable data from a sensor that is easily maintained and long-lasting.
Turbidity: Self Cleaning Measures from 0 to 3000 NTU and includes a user-programmable cleaning system to remove any fouling that could otherwise affect readings	Chlorophyll a The most accurate Chlorophyll a sensor available on a multiprobe.	Depth/Vented level High-stability, custom-made pressure sensors with four range options.
Rhodamine WT The most accurate and affordable Rhodamine WT sensor available on a multiprobe.	Blue Green Algae Uses fluorescence technology to provide real-time measurements of cyanobacteria.	Total Dissolved Gas Measures the amount of total gaseous compounds dissolved in a liquid
Ion Selective Electrodes Available for measuring Ammonia, Nitrate, or Chloride.	Dissolved Oxygen Based on a standard Clark Cell design, which is EPA approved, and has been trusted for more than 30 years	ORP Monitors chemical reactions, quantifies ion activity, or determines the oxidizing or reducing properties of a solution
Li-Cor® Ambient Light Also called a Photosynthetically Active Radiation (PAR) sensor; provides a measurement of sunlight intensity at a specified point in the water column.	Temperature A 30k ohm variable resistance thermistor is included with every Hydrolab sonde	Turbidity: 4 Beam Compliant with 4B-GLI Method 2 and perfect for profiling or spot-check turbidity measurements