Karishma Instruments Pvt. Ltd. Offers Ozone Meter for Pure Water. Karishma Instruments Pvt. Ltd. Manufactures Laboratory Turbidity Meter, On-line Turbidity Meter, Fluorescence Meter, and Absorption Meter etc. The Ozone Meter for Pure Water is built to accommodate up to three different light sources [UV and visible range] for the measurement of colour, DOC and concentrations [Ozone].