"Three-In-One Enterprises Co., Ltd." was established in 1974 in Taiwan and it is a professional well-known and leading manufacturer of refractometers as well as endoscope, borescope, include Camera Scope, Video Scope, Image Scope, Blue Light Image Scope, T-Type Image Guide Scope and tools & testers, windshield tool, battery tester and antifreeze tester.

We offer a wide range of refractometers in the World include Handheld refractometer, Digital refractometer, Jombo refreactometer and Abbe refractometer

Our Jombo refractometers will automatically compensate for variations in temperature. This means ultimate accuracy without temperature correction charts or temperature measurement and is made to the highest standard.

With over 34-years of professional team support, our refarctometer has cover industrial like Brix, Industrial Fluid, Salinity, Clinical Protein like Urine Specific Gravity and Serum Protein, Alcohol, antifreeze, Battery and Cleaning Fluid.