Operating Instructions for 395 Coolant Refractometer
Your refractometer is designed to give an accurate reading regarding the freezing point of
Propylene or Ethylene Glycol antifreeze as well as the condition of automobile batteries.
It is a precision instrument and care should be taken to avoid shock due to impact and other
sever handling.
Before using for the first time and periodically thereafter, the refractometer should be calibrated
as follows:
1. Locate the small vial of distilled water included with you refractometer.
2. Lift the plastic comer plate off the glass prism on the refractometer and place a drop
of distilled water onto the glass. Put the plastic cover plate back down onto the glass
and press very gently.
3. Look into the refractometer and aim it at a light source so that light enters the glass
prism. Adjust the ring at the eyepiece so as to focus the scales. A shadow will form
a line across the scales. For distilled water the lines should be at the bottom of the
scales and read straight across at 32°F and 0°C. If the shadow is not on this line, the
refractometer should be adjusted.
4. If adjustment is necessary, remove the small rubber cap covering the adjustment
screw. This is located just above the hinge for the plastic cover plate. While looking
into the eyepiece, use the included screwdriver to slowly turn the adjusting screw until
the shadow lined us at 32°F and 0°C. When this is complete, replace the rubber cap
onto the adjusting screw and clean the distilled water from the glass with the included
cloth.
To use your refractometer, place a drop of coolant or battery fluid onto the glass prism in the
same way you used the distilled water for calibration. The unit has two coolant scales, one for
Ethylene glycol and one for Propylene glycol. Be sure to reference the correct scale for the fluid
you are checking. The coolant scale simply indicates the freezing temperature of the coolant
being tested. The battery fluid scale shows the specific gravity in numbers as wall as
“Recharge / Fair / Good”.
Be sure to clean the glass prism after each use to avoid false readings. Use the cloth included,
or a clean soft lint-free cloth such as an eyeglass cloth. It must be thoroughly cleaned after
each use to avoid inaccuracy in subsequent readings. Wipe to clean. Do not immerse in water
or solvents.
Be sure to store the refractometer in the included case to avoid accidental damage.
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