From the service manual:
COOLANT CONCENTRATION TESTING
Coolant concentration should be checked when any additional coolant was added to system or after a coolant drain, flush and refill. The coolant mixture offers optimum engine cooling and protection against corrosion when mixed to a freeze point of -37°C (-34°F) to -46°C (-50°F). The use of a hydrometer or a refractometer can be used to test coolant concentration.
A hydrometer will test the amount of glycol in a mixture by measuring the specific gravity of the mixture. The higher the concentration of ethylene glycol, the larger the number of balls that will float, and higher the freeze protection (up to a maximum of 60% by volume glycol).
A refractometer Tool 8286 (Refer to 7 - COOLING - SPECIAL TOOLS) will test the amount of glycol in a coolant mixture by measuring the amount a beam of light bends as it passes through the fluid.
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Originally Posted by JustForFun
Here is the interesting part.
He also said that because the 300 uses the new HOAT antifreeze, that a typical 5-ball tester can't be used and that they have to use one espcially designed for that type of antifreeze. He suggested that because I was using an older "normal" antifreeze type tester, the reading was not accurate.
Anybody else ever heard of this? Does this HOAT type antifreeze require a "specific" type of tester now?
What do you guys think?
JFF 
EDITED TO ADD:
Here is an interesting link on antifreeze types:
LINK
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