OCR 5Pcs NTC 10K 3950 Ohm Waterproof Digital Thermal Temperature Sensor Probe 1M

We wanted more information before purchasing. Were they thermocouples, thermistors, semiconductors,, or what? More information urgently needed in original listing.The sensor got separated from the first controller and we couldn't find how to find a replacement. The listing didn't clearlyconnect these sensors with the conroller. Big uncertainty!

Ordered these to work with my Inkbird ITC 1000 temp controller. Work fantastic! All I did was cut off the connector, splice to the old wire (needed longer then the 3' cord they supply) and turned it on. Sensor was way more accurate then the one that came with the controller. Happy, will see how long it lasts. The original ITC sensor lasted about 1 year.

A reasonably accurate device, that is easy to interface with devices like the M0 Feather or the Arduino.

These NTC temperature sensors worked great as a direct replacement for the low budget temperature controllers found on Amazon. The package of 5 ensures my hot tub will not go without a temperature sensor for many years. The first sensor has been in use for ~3 months.

Good for use with arduino. Connectors are a bit large. System is nice and water tight though and temperature readings don't fluctuate more than .5 degree F.

Seller could not give specifications for these probes, but for the price they should do fine and can be calibrated in the system.

Dos the job. Not as sturdy as other reviews may lead you to think but you shouldnt be reckless with your stuff either. Nice fit!

Used these on the AgSense Commander VP's. Cut the connector off and stripped ends to use. Works great. Now have the temp at pivot points. Also if a person logs in to wagnet and look at appropriate cammander, it will calculate GDD's.

Aug. 25, 2017 - Update: (2 thumbs up on this item)I have been experimenting with these for a week now and continue to be impressed with the easy setup, accuracy and close agreement between sensors. I recently completed a sketch that runs 4 of these for near simultaneous temperature readings and the consistency of the readouts is better than anything else I have tried (close rival is the DS18B20 module). Typically the maximum spread is around 0.2 C and often as not 1 - 3 of the 4 sensors read the same temperature.I am currently modifying my sketch to run up to 10 of these sensors on a Mega 2560 board to better assess the consistency of the readings.=========================================================================================================I had my doubts when I first opened the package and looked at these temperature probes. I thought that I had ordered a different one. My biggest concern was whether or not I still had to add an external resistor and if the pins would fit on a header board.A bit of online research led me to the Adafruit Circuit Playground and an excellent article on connecting this type of temperature probe. It is necessary to build a simple voltage divider using a 10k resistor. Ground one end of the 10k resistor, plug +5V in to one side of the probe's 2 pin connector (yes: - breadboard jumper wires do fit fully in the connector), plug in another male-male jumper wire in to the other side of the 2 pin connector and attach it to the non-GND end of the 10k resistor, add one more jumper from the same row to the A0 pin or your Arduino board.Copy and paste the code in to a sketch in the usual manner. I did modify the screen parameters to use my i2c 1604LCD display (load the NewLiquidCrystal library to use this screen.I added a few extra sections similar to what the downloaded code has to print a message for various temperature ranges (comfortable, hot, very hot, boiling, cool, cold, freezing and so on.It all compiled on the first attempt (encouraging sign), so I loaded it to my Nano clone and it all worked great on the 1st attempt. Super easy!I've been running a DHT22 sensor on another board and initially the temperatures were off by a degree or two in either direction. With nothing to lose I warmed the probe in my hand to very near body temperature, dipped it in some hot tap water, microwaved that same cup to boost the temperature to approx. 65 C, let it cool to room temperature and then taped it between a couple of freezer cooler packs. I still had a small air gap on each side but did manage to get the temperature down to -8.35 C.I was impressed with the math in the sketch that I downloaded as well. It seems to be fairly accurate and well worked out, highly recommended as an excellent starting point.After that, I let the probe warm to room temperature and after watching it for the last 2 hours versus the DHT22, I'm impressed with the accuracy.Typical differences in reading have been as low as 0.01 C with a maximum spread of approx. 0.25 C. Typically, this probe reads just a bit lower than the DHT22 (which is considerably more accurate than the DHT11).I may add a tri-color LED to light up when the temperature is in various ranges (blue for too cold, green for comfortable and red when it get's too hot.Perhaps, expand on that code a bit and flash the blue and red when it gets near freezing or near body temperature.One other use I have planned at this time is to use 4 sensors to measure the input, top and rear exhaust, and the exhaust air from my computer's graphics card. I've long been curious about the actual difference in temperature between those values.If I ever get my NRF24 projects going I will likely have to buy another set of 5 so I can scatter some around the house and put one outside in the shade with a ventilated box that's shielded from the rain and snow.

I bought these probes as spares for a faulty $130 PTC probe on a cooling unit. I knew the thermostat could be used with NTC probes as well. For the price, it was worth a shot. At first, temps were off by 3-4C degrees. But after a few days, temps became spot on. I don't know how or why it happened, but now I got an accurate replacement probe and 4 spares for way less than the original probe.

used to replace sensor on expensive heater and was able to repair the heater.

Works

Works