I bought three for pH controller. Built-in NTCs add $25-$50 to your pH electrode every time you buy one (usually once a year). The probe is 4mm in diameter which is way too small for my 5mm probe adapter :(. Too bad they didn't specify that in the description. Only 2 are used; the 3rd is optional. For those who buy this Extra length cable - not required for NTC You need special cable for thermocouples but not for NTC You just need regular cable with minimal electrical noise (modestly removed from motors and moving cables)
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