Reddit reviews Proster Digital Thermocouple Temperature Thermometer with Two K-Type Thermocouple Probe Backlight LCD K Type Thermometer Dual Channel for K/J/T/E/R/S/N Type
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【Support K/J/T/E/R/S/N Type Thermocouples Measurement】Packed with two K-Type thermocouples, this Proster Digital Thermocouple can direct measure the temperature of tested object【Considerable Measuring Range】Can be used to measure the temperature of liquid / vapors and surface temperature of a solid object.Also suitable to be used both in the high temperature fields of blast furnance and cookery and the low temperature measuring for liquefied hydrogen and liquefied nitrogen etc【High Accuracy】K-type Thermocouple Measuring range: -50~300℃ ; Accuracy: ±1.5%; Resolution: 0.1℃/℉＜1000°,1.0℃/℉≥1000°【Functional Design】Data Hold Function;MAX/ MIN/ AVG Value Measurement;Auto Power Off; Double display with LCD Backlight shows T1/T2 and combination of T1 and T2【Wide Applications】Fish tank, pool, furnaces, ceramic, pottery, molten metal etc.
https://www.amazon.com/gp/product/B071V7T6TZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
No problem! Apart from building the thing, you either need a MAX31855 type K thermocouple or a MAX31856 type S along with a fitting sensor probe with a ceramics enclosure that matches the type. The type defines what metals are used in measuring temperature in the thermocouple. Type K maxes out just around the temperatures you are dealing with but they are common and quite cheap. Type S has Platinum and can handle much higher temperatures and is therefore much more expensive and not that easy to find.
If you don't want to build anything and just want to read the temperature while you are at it, maybe something like this would work if you also got either a K or S probe to go with it: Amazon
The thing with pottery is that the part where everyhing goes is the kiln - twice - is very long and you want to log that data and monitor it remotely. The Arduino+MAX31855+Type K probe in the exhaust vent+Blynk was rather successful!
so this is the small reader lots of us like to use
https://www.amazon.com/Proster-Thermocouple-Thermometer-Dual-Channel-Thermocouples/dp/B071V7T6TZ/ref=sxin_3_ac_d_rm?ac_md=3-3-dGhlcm1vY291cGxlIHRoZXJtb21ldGVy-ac_d_rm&keywords=thermocouple&pd_rd_i=B071V7T6TZ&pd_rd_r=3e8ebea1-82c3-486e-953e-e635e8fe5f04&pd_rd_w=IaPyI&pd_rd_wg=EdCwI&pf_rd_p=d29bc9bc-49e2-46b8-bc05-387917c341ec&pf_rd_r=SWVR70TWEY8C09VTBR46&qid=1568747104&s=gateway
but those plastic coated probes are probably not very food safe.
https://www.amazon.com/PerfectPrime-TL1815-HeadProbe-Thermocouple-Temperature/dp/B0142RXG84/ref=sr_1_4?crid=13PYZH2BI268S&keywords=type%2Bk%2Bthermocouple&qid=1568747092&s=gateway&sprefix=type%2Bk%2Bthermo%2Caps%2C167&sr=8-4&th=1
that works pretty well. the downside is since it's just a wire, it can easily get moved around and then you'll get different readings at different times.
i'm trying to use something more stiff/firm like this
https://www.amazon.com/PerfectPrime-TL1815-HeadProbe-Thermocouple-Temperature/dp/B01MU29Q3Z/ref=sr_1_4?crid=13PYZH2BI268S&keywords=type%2Bk%2Bthermocouple&qid=1568747092&s=gateway&sprefix=type%2Bk%2Bthermo%2Caps%2C167&sr=8-4&th=1