The largest and sharpest display scale available! 
This handheld analog refractometer features an exclusive zero-ring which requires no calibration tools. 
Exceptionally simple to operate and provides quick, accurate measurements. 
Simply place one or two drops of sample on the prism, closing the daylight plate over the sample, then look through the focusable, cushioned rubber eyepiece for the readings. 
Rubber grip guards against the user’s hand heat for accurate measurements. 
 
Durable, all-metal design. 
Sample type: transparent, translucent, and opaque. 
Sample quantity: >0.1 ml. Range: 0-32%. 
Resolution: 0.2%.
Accuracy: ±0.2%. ATC: 10-30° C. 
Calibration liquid: distilled water. 
 
Dimensions: 1-1/2 in. x 1-1/2 in. x 6-1/2 in. Comes with carrying case, plastic transfer pipette, and instruction manual.