I went to the Thermapen website and found the basis of their bullshit.
Other digital thermometers found today in retail outlets use a very cheap sensor called a thermistor. The only problem with that is they're relatively slow, taking 20 to 30 seconds to read a complete temperature. Many are even advertised as "Instant Read" and some packages boast a 1 second response time.
I laugh and laugh at this. Thermistors are far cheaper than thermocouples? Thermocouples cost about 20 cents in a Thermapen application. All instant read thermometers that I've seen use thermocouples. They have the golden goose selling a $10 item for over $50.
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