The ATR-ST Series Automatic Refractometers from Schmidt+Haensch offer the core features of the higher-end ATR-Series instruments, but at an economy budget level. The price performance ratio of these refractometers is exceptional. The small footprint of the single instrument design will easily fit in any laboratory. All models feature a removable Teflon prism well insert. This feature is exceptionally useful for applications involving the measurement of organic solvents and other caustic solutions, which are extremely harmful to the prism sealant for all other types of refractometers.