
LAS ER R ADI ATIO N – 
CLASS 2 LASER PRODUCT,  
CONFORMS TO IEC825-1:1993
LASER RADIATION 
DO NOT STARE INTO BEAM
WAVELENGTH 600-700 nm
POWER <1mW-CLASS II 
LASER PRODUCT, COMPLIES 
WITH 21 CFR CHAPTER 1, 
SUBCHAPTER J.
CAUTION
  
OMEGA ENGINEERING, INC.,
STAMFORD, CT 06907 U.S.A.  MADE IN TAIWAN
CAUTION!
 – This product 
is not intended for medical 
use or use on humans
Stick Type Infrared Pyrometers
Combination! Contact and Non-Contact (IR) 
Food Service Model with Type K Input
OS643 Series
Starts at
$
65
Optional
All models shown 
close to actual size.
Food Service
Model 
OS643W
OS643, °C/°F
switchable, $65.
OS643 
°C/°F Switchable
Detection Element: Thermopile 
Sighting: Laser marker 1 mW 
Backlit LCD Display 
Analog Output: 1 mV/°C/°F 
Emissivity: 0.95, accuracy ± 3% 
Temperature Range:
0 to 260°C (0 to 500°F )
OS643W 
Switchable from IR to T/C
Temperature Range:
IR: -18 to 260°C (0 to 500°F)  
T/C: -50 to 1093°C (-58 to 2000°F)
Accuracy: IR: ± 3% rdg
T/C: ± 0.3% rdg + 2°F 
Analog Output: 1 mV/°C/°F 
Emissivity: 0.95 
Detection Element: Thermopile
OS643W, °C/°F
switchable 
with Type K
thermocouple
input, $110.
Accessories
To Order (Specify Model Number)
Model No.  Price Description 
MN2400 $3 Extra “AAA” alkaline battery 
OS-643-NIST 90 NIST-traceable calibration certificate (no data points) 
CAL-3-IR 125 NIST-traceable calibration certificate (data points) 
STICK-CABLE 9 Analog output cable 
Comes complete with soft vinyl carrying case, 4 “AAA” alkaline batteries and operator’s manual. 
OS643W comes with beaded wire Type K thermocouple.
J-31

High Temperature Infrared 
LAS ER R ADI ATIO N – 
CLASS 2 LASER PRODUCT,  
CONFORMS TO IEC825-1:1993
LASER RADIATION 
DO NOT STARE INTO BEAM
WAVELENGTH 600-700 nm
POWER <1mW-CLASS II 
LASER PRODUCT, COMPLIES 
WITH 21 CFR CHAPTER 1, 
SUBCHAPTER J.
CAUTION
S   
OMEGA ENGINEERING, INC.,
STAMFORD, CT 06907 U.S.A.  MADE IN TAIWAN
CAUTION!
 – This p roduct 
is not intended for medical 
use or use on humans
Pyrometers (-4°F to 752°F)
Some with Adjustable Emissivity (0.10 to 1.00)
The OMEGA®OS640 series IR's 
without adjustable emissivity have
OS643E °C/°F 
switchable, $99.
All models shown 
close to actual size.
an analog output that can be 
interfaced to recorders/data loggers 
such as the RD101A recorder. (See 
Section S for additional information).
Selection Guide 
To Order (Specify Model Number)
Model No. OS643 OS643E OS643W 
Price $65 $99 $110 
Backlit LCD ⻬⻬ ⻬ 
Resolution (counts) 1999 1999 1999 
Laser guide (5mW) 
Emissivity (E) 0.95 Adjustable 0.10 to 1.00 0.95 
Range C° 0 to 260 -20 to 400 IR: 0 to 260; TC: -50 to 1300 
Range F° 0 to 500 -4 to 752 IR: 0 to 500; TC: -58 to 2000 
Auto hold ⻬⻬ ⻬ 
Auto power-off ⻬⻬ ⻬ 
Analog output
1 mV/°C or °F ⻬⻬
Comes complete with soft vinyl carrying case, 4 “AAA” alkaline batteries and operator's manual. 
Ordering Example: OS643E, infrared pyrometer °C/°F switchable, $99.
J
OS643E 
Infrared Thermometer 
°C/°F Switchable
Detection Element: Thermopile 
Sighting: Laser marker 1mW 
Backlit LCD Display 
Emissivity: Adjustable 
0.10 to 1.00
Temperature Range:
RD101B, $2330, shown smaller 
than actual size, see section S.
Common Specifications
Basic Accuracy: 
°C: ±3% or ±3°C (whichever is greater) 
°F: ±3% or ±5.5°F (whichever is greater) 
Sensor: Thermopile 
Resolution: 1° 
Dimensions: 170 H x 44 W X 40 mm D
(6.7 x 1.8 X 1.6") 
Weight: 160 g (5.5 oz)
-20°C to 400°C (-4°F to 752°F)
AVAILABLE FOR FAST DELIVERY!
J-32

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