[Dusk Blue Z]

Sam,

The reading you would get from the upper radiator hose would be an accurate temperature of the surface of the hose not the fluid inside it. I am at a customers site this week and don’t have access to all my reference material which would list the different emissivities for materials and paint colors. The emissivity number is a multiplier for the radiated heat that the radiometer picked up to give an accurate temperature reading. Your unit is fixed at 0.95, the more expensive units would allow you to input the number for your target material.

I think if you read off the top of your bare aluminum housing you would be within 5 degrees of the true temperature.

I am making plans to attend SCR 10. If anyone would like to have me measure their car to check their gauge accuracy just drop me your name and description of your car and I’ll look you up.

Mike