I bought three for the 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 too small for my 5mm probe adapter :(. Too bad they didn't specify that in the description. Only 2 are used; the 3rd will be optional. For those using this for extra wire length - not needed for NTC You need special wire for thermocouples, but not for NTC You just need regular wire with minimal electrical noise (modestly removed from motors and moving wires).
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