Model 421501 Version 1.3 February 2006
2
Warranty
EXTECH INSTRUMENTS CORPORATION
warrants this instrument to be free of defects in parts and
workmanship for
one year
from date of shipment (a six month limited warranty applies to sensors and cables).
If it should become necessary to return the instrument for service during or beyond the warranty period,
contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website
www.extech.com for contact information. A Return Authorization (RA) number must be issued before any
product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper
packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the
user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for
a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's
total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no
other warranty, whether written or oral, is expressed or implied.
Specifications
Display
3-1/2 digit LCD (2000 counts)
Battery Power Supply
9V DC battery.
Battery life
200 hours typical
Dimensions / Weight
7.5 x 3.6 x 2.1” (192 x 91 x 52.5mm); 11.7oz. (365g)
Range / Resolution
-58 to 2000
o
F (-50 to 1300
o
C); 1
o
or 0.1
o
F/
o
C
Important Note
: The supplied thermocouple can only
be used to measure temperature up to 500
o
F (260
o
C).
To measure higher temperatures, a high temperature
Type K thermocouple must be used.
Temperature units
Selectable
o
C or
o
F temperature units
±(0.3% of r 1
o
C) from -50
o
C to 1000
o
C
±(0.5% of r 1
o
C) from 1000
o
C to 1300
o
C
Accuracy of meter
±(0.3% of r 2
o
F) from -58
o
F to 2000
o
F
Temperature Coefficient
0.1 times the applicable accuracy specifications per
o
C
from 0
o
C to 18
o
C and 28
o
C to 50
o
C (32
o
F to 64
o
F and
82
o
F to 122
o
F)
Water resistant housing
Gasket protected front panel
Input Protection
24VAC/DC max. input on any combination of inputs
Reading rate
2.5 times per second
Thermocouple connection
Meter accepts standard subminiature connector
Supplied thermocouple
Teflon insulated Type K thermocouple (4’ length)
Max temperature: 500
o
F (260
o
C); For higher
temperatures, a high temp thermocouple must be used.
Accuracy: ±4
o
F (±2.2
o
C) or +0.75% of rdg
(whichever is greater) from 32 to 1472
o
F (0 to 800
o
C)
Operating conditions
32 to 122
o
F (0 to 50
o
C); less than 80% RH
Storage conditions
-4 to 140
o
F (-20 to 60
o
C); less than 70% RH
