Alarm Clock-Thermometer-Voltage etc

[bigherb]

No because you are still not removing any heat. The wind doesn't make ice any colder

[LeeME3]

But wet bulb temperature takes account of moving air doers it not therefore if the sensor is damp wind will have a chilling effect? Or is it that human skin feels a lower temperature due to evaporation and wind carrying out surface moisture but of course a temp sensor cannot 'feel'...???

[bigherb]

Or is it that human skin feels a lower temperature due to evaporation and wind carrying out surface moisture but of course a temp sensor cannot 'feel'...???

Your pretty much there.

[LeeME3]

I need a lie down...

[a1winchester]

No because you are still not removing any heat. The wind doesn't make ice any colder

Tell that to the penguins!

If I remember my 'O' Level Physics, it's due to Latent Heat of Evaporation, and is the principal used in refridgerators.
It's why a simple fan cools you down on a hot day (remember them?) even while the air is hot that you are wafting over yourself.

I agree. A lie down is in order.

[ghost123uk]

I have just splashed out and bought one of these:



http://www.amazon.co.uk/Alarm-Temperatu ... eter+Clock

I usually disconnect my starter battery if I leave the van un-used for any time. So the dash clock is never the right time.
This little clock plugs into the cig lighter and has a back-up internal battery to keep it going when the 12V power is off.

The other useful thing about it is that it gives you a battery charge (voltage) reading, plus inside / outside temperature.

I have no idea how accurate these readings are, but for the price I am not too worried

I will let you all know how I get on with it, and if it lasts more than a week!

So good I just ordered one from your link (mind you, I hate supporting the Chinese manufacturing industry)

Update = Well in my opinion, more Chinese carp as I suspected.

The Voltmeter on mine reads about .8 of a Volt low
The outside temp sensor reads all over the place. I suspect this is due to moisture on the unsealed contacts in the sensor (I might try and seal it)
The "icy road" alarm is a damn nuisance as you cannot turn it off. Even worse when I had the unit wired permanently on, it woke me up at 4am one night!
The "icy road" alarm actually stopped working recently. Good news or bad ? At least it won't pee me off on a long journey at minus temps outside.
The clock re-sets itself to 12:00 whenever the inside of the van gets very cold (most nights recently)

So all in all not worth the effort of fitting it