User’s Manual
InfraRed Thermometer with Laser Pointer
MODEL 42525A
Model 42525A Version 4.0 5/05 2
Introduction
Congratulations on your purchase of Extech’s 42525A IR Thermometer. The Model
42525A provides non-contact (IR) and contact (type K) temperature measurement
capability. The built-in laser pointer (activated by pressing the meter’s trigger) increases
target accuracy. The Model 42525A has an RS-232 PC Interface jack for recording
readings as they are taken. Professional features include EMISSIVITY ADJUST,
RELATIVE MODE, DATA HOLD, DISPLAY OFFSET, and MIN MAX DISPLAY. Proper
use and care of this meter will provide years of reliable service.
Safety
1. Use extreme caution when the laser beam is ON
2. Do not point the beam toward anyone's eye
3. Be careful not to let the beam strike the eye from a reflective surface
4. Do not use the laser near explosive gases or in other potentially explosive areas
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.
Model 42525A Version 4.0 5/05 3
Specifications
General Specifications
Display 0.4" (10mm) 5-digit LCD display
Sample rate 1 sec. approx.
Over range indication Dashes are displayed when the reading exceeds specified limits
Laser pointer Laser power < 1mW (red)
Max/Min Recording Allows user to view only the MAX or MIN readings
Data output RS-232c PC Interface for use with WindowsTM based communications
programs; Connection via 3.5mm phono jack on side of meter
Operating Temperature 32°F to 122°F (0°C to 50°C)
Operating Humidity 80% RH maximum
Power Supply 9V battery
Battery Life Approx. 40 hours (20 hours with laser pointer ON)
Weight 0.6 lbs. / 265g
Dimensions 7.7 x 4.7 x 2.3” (195 x 120 x 58 mm)
Infrared Thermometer Specifications
Range / Resolution -4 to 752
o
F (-20 to 400oC) 0.1oC/F
Accuracy ± 3% of reading or ± 6oF (3oC) whichever is greater
Accuracy notes
1. Accuracy specified for readings between -10 and 350
o
C
2. Accuracy specified for ambient temperature (23
o
C ±5oC)
3. Accuracy specified for an emissivity of 0.95
4. Accuracy tested using 2.25” diameter black body at a distance of 6”
5. Testing environment: RF field strength < 3 V/M and frequency < 30MHz
Emissivity adjust 0.20 to 1.00 (factory default: 0.95)
Distance Factor D/S = Approx. 6:1 ratio (D = distance, S = spot)
Wavelength 6 to 14 µm
Type K Thermocouple Specifications
Range / Resolution -148.0 to 2372.0
o
F (-100.0 to 1300.0oC) 0.1oC/F
Accuracy ± (1% reading + 2oF); ± (1% reading + 1oC)
Accuracy note Accuracy specified @ 23o ± 5oC
Thermocouple characteristics are not reflected in the Accuracy specs.
Linearity correction stored in CPU
Sensor type Type K (NiCr – NiAl) Thermocouple (sold separately); Connects to
thermocouple jack on side of meter
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