Amprobe AM-140-A - Manual (Page 14)

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Note: Unlike the Line Level Frequency measuring function as previously stated,
this Logic Level Frequency function is set only at the highest input sensitivity
for measuring digital type electronic signals.
T1-T2 Dual Channels Temperature function (AM-160-A only)
Press SELECT button momentarily to toggle between °C and °F readings, and
the new setting will be saved automatically in the non-volatile memory as
power up default. Press T1-T2 (RANGE) button momentarily to select T1, T2, or
T1-T2 readings.
Note: Insert the banana plug K-type temperature bead probe with correct
polarities. Dual channels T1-T2 readings require 2 probes. You can also use a
plug adapter (Optional purchase) with banana pins to K-type socket to adapt
other standard K type mini plug temperature probes.