$1 Chinese thermometers?

[kalel]

I'm wondering about what technique these use for their probes:



and do they have a place in electronics use.

They are about $1 now with free shipping, which definitely makes them as cheap as possible.

The data cited is below (some do come with batteries):

Features:
Modeling simple, elegant, LCD panels inline connections, moisture-resistant,
strong anti-interference, applies to refrigerated cabinets, display counters and
other needs of temperature measurement and display of various equipment.
Specification:
Temperature range: -50~ 110°C
Temperature display resolution: 0.1°C
Temperature measurement accuracy: 1°C
Long probe line: 1 meter molded case probe
Colour: black
Size: 47*28*14mm
Weight 22G
2 x LR44 button battery (Batteries not included)
Package Content:
1 x Digital LCD Thermometer without  retail box

What it doesn't say is anything about the technology they're using to get the temperature measurements. What's inside of the probe? Is the accuracy an indication? Can they be used to measure some temperatures of e.g. LEDs or resistors similarly to thermocouple probes? Someone might have more information on these.

Obviously the 110 C range (if true) is somewhat limiting, but there are many things that could be measured within this range. As for any difference between multiple units, I assume these can be written down and then considered when taking measurements (they are probably difficult to adjust internally).

[edavid]

thermistor

http://www.ebay.com/itm/1M-Long-NTC-10k-Thermistor-Temperature-Control-Sensor-Probe-Extension-Cable-WS-/322568175070

They work OK, but they are too slow for workbench use.

[thm_w]

They work well enough for measuring temperature in the house or fridge, etc. to make sure food is safe temperature for example.
The one I have here uses a NTC thermistor. Accuracy will get worse as you go to the extremes (>70C etc.)
http://www.learningaboutelectronics.com/Articles/Thermistor-resistance.php


"Can they be used to measure some temperatures of e.g. LEDs or resistors similarly to thermocouple probes? "

With that large metal probe thats going to be too hard, and take a long time to heat up, you want something with a smaller tip.

[kalel]

Got it, a bit slow and a bit difficult to use for electronics due to the size. Thank you both for the useful information.

[Vtile]

Have you looked up ie. components like LM35 which is easy to use and rather accurate 3-wire temperature sensor. That is if you aren't looking a ready module.

[kalel]

Have you looked up ie. components like LM35 which is easy to use and rather accurate 3-wire temperature sensor. That is if you aren't looking a ready module.

I was considering affordability in integrated modules, but this is something good to know about for any MCU projects. Perhaps it could even be used with a multimeter as it is linear.

[MosherIV]

You really love cheap tat

Have you looked for TM902C thermocouple thermometers, they are available for $4 ?

https://www.eevblog.com/forum/testgear/tm902c-quality-and-accuracy/msg1237420/#msg1237420