Tethys Instruments is a leading global provider of gas and water online analysers for environmental applications. Headquartered in France, our distributors worldwide and us provide top-class service and instrumentation for environmental monitoring. Our technology based on UV spectroscopy offers unparalleled reliability and very low operating cost. Our new generations of gas and water analysers based on high speed digital signal processors provides unsurpassed performances in terms of response time, repeatability, ease of use, reliability.