Propylene Glycol Range: -50ºF to 32ºF
Ethylene Glycol Range: -60ºF to 32ºF
Dimensions: 27 x 40 x 160mm
Weight: 176 grams
 
Open daylight plate and place 2-3 drops of the liquid sample on the main prism. Close the daylight plate so the sample spreads across the entire surface of the prism without air bubbles or dry spots. Allow the sample to rest for 30 seconds. Hold the daylight plate in the direction of a light source and look into the eyepiece. You will see a circular field with graduations down the center. The upper portion of the field should be blue. Take the reading where the boundary line of blue and white cross the graduated scale. The scale will provide a direct reading of the freezing point of antifreeze solutions or the charge level of battery fluid.