User’s Guide
Dual Input, 3-Display Thermometer/Datalogger
Model 421509
• Accepts J, K, T, E, R, S, & N thermocouples
• Internal Memory stores up to 16 data sets,
with 1024 maximum data capacity
• Backlit Electro-luminescent LCD Display
• T1 / T2 / T1 – T2 displays
• MIN / MAX / AVG Record/Recall
• Selectable temperature units (C/F)
• Data Hold, Relative Mode, Elapsed Timer
• Bi-directional RS-232 PC Interface
Introduction
Congratulations on your purchase of Extech’s Dual Input, 3-Display, Hand-Held Digital
Thermometer/Datalogger. This portable digital thermometer is designed to use external K /
J / T / E / R / S / N type thermocouples (K-type supplied). Temperature indication follows
Reference Temperature/Voltage Tables (N.I.S.T. Monograph 175 Revised to ITS-90). It
features an adjustable T/C offset and an RS-232 interface for uploading data to a PC using
optional software and cable. This professional meter, with proper care, will provide years of
safe reliable service.
ESC - 0
ENTER
123
456
789
DISPLAY
¡C/¡F
[Limits]
LOG
READ
TYPE
T1/T2
REL
HOLD
SHIFT
[OFS]
CLR ?
SET[ ]
SAVE
READ
[TIME]
T1-T2
[APO]
MAX/MIN
[INVT]
TYPE
T1/T2
MAIN
SECOND
THIRD
421509
T1
¡F T1-T2
K
APO
¡F T1
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
