Extech 421502 Type J/K, Dual Input Thermometer with Alarm
The Extech 421502 is a high‑precision dual‑input thermometer designed for industrial‑grade temperature measurement. It supports both Type J and Type K thermocouples, displays two channels simultaneously (or their difference), and features programmable high/low audible alarms — making it ideal for monitoring critical temperature points and spotting deviations quickly.
Description
This instrument is built for serious temperature measurement. With two thermocouple inputs (T1 and T2), you can monitor two points at once or display T1 minus T2 to see temperature differentials — useful when comparing two surfaces or components.The supported temperature ranges are broad: with Type J probes from about ‑200 °C to 1050 °C (‑328 °F to 1922 °F) and Type K probes from about ‑200 °C to 1370 °C (‑328 °F to 2498 °F) according to specs.
Features
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Dual thermocouple inputs (T1 & T2) allowing simultaneous readings or differential mode (T1‑T2).
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Supports Type J and Type K thermocouples: J range approx ‑200 °C to +1050 °C; K range approx ‑200 °C to +1370 °C.
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Programmable high/low audible alarms (beeper approx 95 dB) for alerting when temperatures move beyond set thresholds.
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Excellent accuracy: for example ±(0.05% rdg + 0.3 °C) in the ‑50 °C to +1370 °C range.
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Large dual‑display panel showing readings for both inputs or differential, plus elapsed time/clock.
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MIN/MAX/AVG capture and data‑hold functions for capturing peak values or freezing readings.
Includes
- Two Type K bead temperature probes
- Protective holster with stand
- 9 V battery
