Laser Thermometer ( Review )

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old4570
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Laser Thermometer ( Review )

 

Wow , been wanting one of these for the longest time :

Yes I was too cheap to buy in at around the hundred mark , the seventy five mark , the fifty mark and even the twenty five mark . The other day I saw twelve and a half Australian bananas , and I had to have one . Not just anyone , it had to not be 9v . I would love to see AA but AAA would have to do . ( 2 x AAA ) 

Now we have a old mercury thermometer that was saying 18.5c , and this IR thermometer was giving 18c .. (?) De we give it to the IR (?) 

Anyhow , taking skin temperatures from about 2 meters returned 26 to 27 Celsius , and from about 15cm gave 30 Celsius .

Wood from about 5 meters or more was about 1deg C out ( 17.3 @ 5meters 18.3 from 30cm )

A nice reflective surface like painted brick ( white ) was about 0.1 celsius out from 5 meters + to 30cm ( 18deg Celsius @ 5+ meters to 18.1 Celsius @ 30cm ) 

Now , I have to say , what a useful little gadget ..  

Takes AAA

Turns on with the press of the trigger , takes temps with a second press 

Turns off automatically 

Draws a minuscule amount of power in use ( 0.02Amp approximately ) 

Cheap

Seems to be well made for the $

so far nothing to complain about

Accuracy ( ? ) A degree here or there ?

Honestly , if you dont have one , why not ?  

 Always remember , the easiest thing in the world to do , is to expel hot air from your lungs and through some vocal chords ..
The resulting sound may , or may not be worth listening too ….

 

Edited by: old4570 on 10/11/2015 - 23:55
Far Thrower
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I bought one of these exact same ones from Gearbest.

It works really well and was so cheap.

I recommend it to anyone.

M4D M4X
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i have the 550 from banggood (15.25 USD/yours is 8.99 there before discount)

the laser is just for aiming and i am not sure where it aims due to the offset…
the IR spot gets around 42cm in diameter @ 5m (spot size is 12:1)

i use it on less than 50 cm most of the time and “scan around“ a bit taking the highest value when measuring the temp of a light for example…

but as you guys said:
go get one everyone! Wink

find all available items in this list

i launched my new blog - all deals for members without MAP B$ Wink

find a short description about my idea here

 

if you want to buy a flashlight or battery for a better price: just send a mail - i will try to save you money!

DanielM
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Can I use it on humans?

Old-Lumens wrote:
I love modding, but I don't have much use at all for flashlights in general.
M4D M4X
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why not?

but turn off the laser before aiming at someones face
that one is very bright!

find all available items in this list

i launched my new blog - all deals for members without MAP B$ Wink

find a short description about my idea here

 

if you want to buy a flashlight or battery for a better price: just send a mail - i will try to save you money!

Lord_Niksidor
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M4D M4X wrote:
i have the 550 from banggood (15.25 USD/yours is 8.99 there before discount)

the laser is just for aiming and i am not sure where it aims due to the offset…
the IR spot gets around 42cm in diameter @ 5m (spot size is 12:1)

i use it on less than 50 cm most of the time and “scan around“ a bit taking the highest value when measuring the temp of a light for example…

but as you guys said:
go get one everyone! Wink

I’ve been wanting one of these for years, what’s the benefitof the more expensive one at banggood, also… Do you have a code?

The Last Katun
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Working well; I’ve got two, one for objects and one for the people; what for people is more accurate but has a narrower range.


Lord_Niksidor
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Thanks Joshk you’re awesome!!!

On a more serious note though, don’t be a jerk.

DanielM
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Anti Banggood drones can’t help themselves.

Old-Lumens wrote:
I love modding, but I don't have much use at all for flashlights in general.
bmwsancho
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There are so many different models for infrared thermometers – is there a point in spending more?

Are the more expensive ones more accurate or better in a way when measuring flashlights?

Joshk
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If you follow my posts you would know exactly what happened to me. But by all means, carry on.

M4D M4X
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the GM550 goes up to 550°C (330°C on the GM320) – the other stats look similar
try the code “cupones” – just a Dollar, but maybe you can use it for “free shipping upgrade” Wink
i bought mine on a flash sale 6 month ago for 9.99 iirc

@Joshk:
i am sorry you feel not handled well (didn´t you get a free light to compensate the wrong item?)
but any shop at any country sells and advertises also sh*t…

find all available items in this list

i launched my new blog - all deals for members without MAP B$ Wink

find a short description about my idea here

 

if you want to buy a flashlight or battery for a better price: just send a mail - i will try to save you money!

Martini
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DanielM wrote:
Can I use it on humans?

You can use it to check skin temperature but not internal temperature. If you’re looking to see if someone has a fever or is suffering from hypothermia, this would not be helpful. For medical use get a dedicated Digital ear thermometer aka Tympanic thermometer. They do a reasonably good job of measuring elevated temperature, though I believe they are unsuitable for use in hypothermia and a rectal thermometer is your best bet.
scdaf wrote:
It’s important to have your restraints within walking distance, lest someone needs restraining. Wink
DanielM
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Martini wrote:
DanielM wrote:
Can I use it on humans?

You can use it to check skin temperature but not internal temperature. If you’re looking to see if someone has a fever or is suffering from hypothermia, this would not be helpful. For medical use get a dedicated Digital ear thermometer aka Tympanic thermometer. They do a reasonably good job of measuring elevated temperature, though I believe they are unsuitable for use in hypothermia and a rectal thermometer is your best bet.

I’d rather not take that bet thank you very much. An armpit thermometer works great for when I need it.

Old-Lumens wrote:
I love modding, but I don't have much use at all for flashlights in general.
Pulsar13
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Yep, these are great. They’re quite spot on for general uses. Very cheap, I was surprised when I got mine and see how good it was.

Only note that you really can’t measure fever with them – you need one of those narrow-range higher-accuracy ones (probably like one of those picture above).

You can point into the ear for inner temperature, BUT, still not good enough. For example, mine has 2’C accuracy, so if someone’s burning up at very dangerous 40’C fever, the ear reading might still show 38’C which says only slight fever, and still be correct within its range.

So again, not for uses which needs higher accuracy. Other than that they’re great for the price.

mattheww
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bmwsancho wrote:
There are so many different models for infrared thermometers – is there a point in spending more?

Are the more expensive ones more accurate or better in a way when measuring flashlights?


Whether you want to spend more depends largely on what you want to use it for. There are three things you get for more money:

1). Wider detection range. There are some models that can accurately measure from -20F (about -30C) to 2200F (1250C) in a single range.

2). Adjustable emissivity. The accuracy of the measurement depends to a certain extent on the emissivity of the material you have the device pointed at. For most materials you can approximate it, and you won’t be far off. IIRC, the usually approximation is about .9. the more accurate the emissivity setting, the more accurate the temperature measurement.

3). Measurement spot size. On the lower end thermometers the measuring spot will be about 1/10 the distance from the object. So if you are ten feet away, the measuring spot will be about 1 foot in diameter. For more money you get a small spot, I have seen them down to 1/120. Obviously if you are looking at relatively small objects from a healthy distance, you want a much smaller spot, at 1/120 the spot is 1 foot in diameter at 120 feet.

The top end devices with the wide temp range, emissivity adjustment and very narrow spot will cost upwards of $1000. As a hobbyist it is doubtful you need that capability, and for most hobbyist applications, a low priced unit will be more than adequate.

bmwsancho
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Thanks, that was very helpful. I guess for looking at flashlight temperatures the cheaper ones will be fine. Don’t think I will ever have -30° in my applications. Also great info on the spot size, but you are right – pointing at a flashlight LED or driver will be fine with almost any of these devices.

M4D M4X had a good point re: range, for my automotive uses a higher range might be useful.

Martini
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That’s fine if you’re checking to see if you should take an aspirin, that’s not what I was talking about. I know Wikipedia is not the best source, but I think this quote sums up what I’ve always been taught as an EMT, so I’ll just leave you with this.

Quote:
Axillary (armpit), tympanic (ear), and other skin-based temperatures correlate relatively poorly with core body temperature.12 Tympanic measurements run higher than rectal and core body measurements, and axillary temperatures run lower.12 The body uses the skin as a tool to increase or decrease core body temperature, which affects the temperature of the skin. Skin-based temperatures are more variable than other measurement sites.12 The peak daily temperature for axillary measurements lags about three hours behind the rest of the body.12 Skin temperatures are also more influenced by outside factors, such as clothing and air temperature.

https://en.wikipedia.org/wiki/Human_body_temperature
scdaf wrote:
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Agro
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I’m wondering what thermometer to buy….GM320 or GM300E.
The latter costs double, but has adjustable emissivity (and larger range which means little to me).
Do you think it’s worth to pay extra?

hIKARInoob
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Agro wrote:
I’m wondering what thermometer to buy….GM320 or GM300E. The latter costs double, but has adjustable emissivity (and larger range which means little to me). Do you think it’s worth to pay extra?

If you want to do measurements on a shiny titanium light, I can imagine you want to adjust emissivity. Comparing titanium to aluminium in terms of thermal properties is an interesting aspect of the hobby.
This is something you can take into consideration.

DB Custom
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Emissivity also matters on a silver aluminum light versus a black one. Shiny is tough to measure as the shiny surface bounces back the light. It gets complicated, like most things, the further you check into it. Wink

Dale

Agro
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I see…for many surfaces GM320 will be OK, but for some – it will be way off.
I could write a calculator to convert values back and forth, but it’s not worth the effort…

hIKARInoob
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Agro wrote:
I see…for many surfaces GM320 will be OK, but for some – it will be way off. I could write a calculator to convert values back and forth, but it’s not worth the effort…

So wait, maybe I’m not getting something. How does the expensive one work? You set emissivity value manually, and then the thermometer gives you a reading? Because then you can indeed do the conversion manually. But it also means you’re the one who determines emissivity value must be altered.
It would be nice if you’re thermometer can read/scan emissivity value of the surface, and then gives you this value along with the temperature, but I’m starting to think this is not the case.

Agro
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Thermometer can’t tell what is the surface emissivity. User has to estimate it by themselves and tell the thermometer, so it can do the calculations internally. I’m not sure how does this particular thermometer’s configuration work – f.e. Flukes have High/Medium/Low.

Note: sometimes instead of adjusting thermometer for surface emissivity you can adjust the emissivity itself by f.e. adding a piece of black tape on the measured element. For various reasons it may not be possible though…

hIKARInoob
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I looked at both, and found out they’re both cheapos; I’ve got the GS320 btw. So you’re probably not going to get accurate results anyway. But maybe with the more expensive one with the adjustable emissivity you can perform like a calibration; you adjust it so the readout equals the value that you know is true.
So the emissivity function is a bit of a gimmick I think, but you could nevertheless use it for your convenience. It’s just a few $ extra anyway.

Agro
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I tried a calculator that converts between apparent and actual temperatures for various emissivity values:
http://www.pyrometer.com/emissivity-calculator
The results are way off for low-emissivity materials.
Let’s take apparent temperature of 150 °C, that’s what IR thermometers measure directly.
GM320 will show the real temperature of 157 °C and it will be correct for 95% emissive body.
But if the body is 60% emissive (not very low really), it’s actually 230 °C – way outside of expected error even for a cheap thermometer.

hIKARInoob
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What you said makes sense: according to Banggood site, the fixed value of emissivity is 0.95, and the adjustable value is 0.10-100. This means there is little adjusting to higher values, and there is more adjusting to lower values. There is adjusting on linear scale, from 0 to 1, but emissivity is I suspect just like many natural phenomena something occurring in the logarithmic scale. So this means large deviations, as you’ve illustrated, comes from stuff that’s shiny. But how shiny is shiny? Eventually you need to know emissivity, or look it up. The GM300E has a “built in” calculator, and that’s it. If you do a lot measurements it could be useful, but if you’re only doing measurements sporadically you may not need it and perform calculations manually. But then again, like I said, it’s only a few $ extra.

Agro
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Normally you just look it up.
For example from
https://www.thermoworks.com/emissivity_table
So “shiny” is 0.03-0.1. I don’t think at this end of the range any of the thermometers above will really work, that’s why I used modest 0.6 in the calculation above.

Yes, all the calculations can be done manually. I just find the extra user friendliness worth the $6.

hIKARInoob
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The table shows that basically most materials that are sort of “rough” have a value of 0.9~0.95. But polished aluminium has a value of 0.05… So this means there are lot of surface finishes of aluminium (and anodisation) that will be in between that will be hard to look up.

Agro
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Indeed.

hIKARInoob
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So what we could do is to take a bunch of battery tubes, put them in the oven with fixed temperature, let’s say 50C or 100C, then open the lid and measure all battery tube temperature values. This should give us insight how emissivity values can vary.

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