new toy a laser thermometer

[Roverlord off road spares]

Was trolling ebay and thought I need a digital laser thermometer, found a few from china, but opted to buy the same from an aussie seller. bought 2 ( one for a mate) Sunday night at the door today, express shipping from Syd.
For under $30, it's going to be handy.
Ist job, check the head temp on my outboard motor.
Tried it out on my body, top half ok :D
The legs a couple of degrees cooler. :( Diabetis does that slow circulation, cold feet..
Apple mac screen top 43c lower screen 30.9c inside fridge 2 deg.
Gee having fun already with it.:cool:
Do I need a digital sound meter? hmm maybe next , got know how loud the v8 exhaust is.:D

[Blknight.aus]

dont forget to carry some matt black paint or to make up a ready reckoner for the emessivity settings.

[Roverlord off road spares]

dont forget to carry some matt black paint or to make up a ready reckoner for the emessivity settings.

Now you've got me , I'll be forced to google that big word.:o

Emissivity depends on factors such as Temperature - Wikipedia, the free encyclopedia, emission Angle - Wikipedia, the free encyclopedia, and Wavelength - Wikipedia, the free encyclopedia. A typical Physical chemistry - Wikipedia, the free encyclopedia assumption is that a surface's spectral emissivity and Absorbance - Wikipedia, the free encyclopedia do not depend on wavelength, so that the emissivity is a constant. This is known as the "gray body assumption".
Although it is common to discuss the "emissivity of a material" (such as the emissivity of highly polished silver), the emissivity of a material does in general depend on its thickness. The emissivities quoted for materials are for samples of infinite thickness (which, in practice, means samples which are Optical depth - Wikipedia, the free encyclopedia) — thinner samples of material will have reduced emissivity.
When dealing with non-black surfaces, the deviations from ideal black body behavior are determined by both the Geometry - Wikipedia, the free encyclopedia structure and the Chemical compound - Wikipedia, the free encyclopedia, and follow Kirchhoff's law of thermal radiation - Wikipedia, the free encyclopedia: emissivity equals Absorbance - Wikipedia, the free encyclopedia (for an object in thermal equilibrium), so that an object that does not Absorption (electromagnetic radiation) - Wikipedia, the free encyclopedia all incident light will also emit less radiation than an ideal black body.
Most emissivities found in handbooks and on websites of many infrared imaging and temperature sensor companies are the type discussed here, total emissivity. However, the distinction needs to be made that the wavelength-dependent or spectral emissivity is the more significant parameter to be used when one is seeking an emissivity correction for a temperature measurement device.
Thus, it is important to understand the distinction between total and spectral emissivity and where they apply.

[spudboy]

^^^ You have too much time on your hands :D

[Blknight.aus]

and probably hasnt read the manual for his hand held temp gun.

[Roverlord off road spares]

and probably hasnt read the manual for his hand held temp gun.
Was there a manual? I just looked in the box and there was a small leaflet I unfolded it and there was and in English too.:) And what you mentioned about masking tape or black paint.

[snowbound]

^^^ You have too much time on your hands :D
Yeah! Like Spudboy says. Are you sure you drive a Land Rover, shouldn't you be fixing something instead of doing all that weird stuff?? What next?? " It's probe time!" :eek:

[LandyAndy]

Next time you are or more the point your good lady is baking with the oven any chance of comparing oven temp to food temp for me please????
I have just invested in an outdoor wood fired oven,from results with cooking sofar it cooks hotter than the temp gauges read.One of these things would be ideal Im thinking ;);););););).
Andrew

[Kev the Fridgy]

For the cost it's probably a good tool for a guide to if you have hot spots etc, the scanner I have cost around $700 and has adjustments for emissivity settings...... so I don't need to graffiti everything with matt black spray:D........ But for scanning around the block and head, Radiator, trans etc there not too bad

[jackafrica]

The cheapie ones can be used as a guide, not accurate to 1 or 2 degrees, but a guide and very useful for comparisons such as described, like radiator temperature, exhaust manifold, brake discs and wheel hubs.

Generally, a reflective surface can give a false reading, however for comparison of spots in the same surface, reasonable.

Beats the pants out of the back of your hand, or a finger with a bit of spit on an exhaust manifold :D

Some of us own metrology instruments, others have a wooden rule or their fingers. To each their own and all points in between.

[scarry]

Had one for a while,they love to give false readings:(

Start checking parts of the car after a long run and it will probably give you a few things to worry about.:D

That you don't need to worry about...:):D

And for guys in our game,just a bit of spit on the discharge line,and compresser shell, is the easy accurate test,works fine...!

[Kev the Fridgy]

Had one for a while,they love to give false readings:(

Start checking parts of the car after a long run and it will probably give you a few things to worry about.:D

That you don't need to worry about...:):D

And for guys in our game,just a bit of spit on the discharge line,and compresser shell, is the easy accurate test,works fine...!

Ha ha ha..... yea you could tell if the system had 12 or 502 in it by how quick it sizzled away....... still have the habit of doing that even with all the digital test gear I have now I still can't resist touching a pipe with a wet finger....old habits die hard hey Paul

[blitz]

yep a fellow fridgy, I have a fluke one - next one will be a thermal imaging camera, about a zillion $$ more expensive but great for normal work and doing consultancy work.