The RFM990 Flow refractometer is a wide range Peltier temperature controlled instrument that has been specifically designed for flow applications. The instrument incorporates a special stand that elevates the instrument to an optimum angle as well as a bubble loop on specific cells, ensuring that sample is presented to the prism without entrapped air and therefore ensuring best performance in the most difficult flow configurations. Supplied as an instrument module only, the customer can choose from a number of standard cells or for special applications, a custom design chamber may be offered at extra cost depending on viability. Available as a five decimal place RI instrument only, customers requiring a lower level of accuracy have the option to switch the resolution.