Infrared & Thermocouple Thermometer - TCT103 / TCT103F

Dual LCD

Retract 180°



Model No



Description IRT + Probe
Measurement range Infrared -33~220°C( -27~428°F)
Thermocouple -55~330°C( -67~626°F)
Infrared Accuracy (Tamb=23±3°C)
±2% of reading or 2°C(4 °F)
which is greater
(Tobj=0~ 65°C): ±1.5°C(2.7°F) ,
else ±2% or 2°C(4°F) which is greater
Thermocouple Accuracy ±1% of reading or 0.8°C (1.5 °F)
which is greater

±0.5°C (0.9°F) (Tobj=-9~100°C),
else ±0.9% of reading or
0.8°C(1.5 °F) (Tamb=23±6°C)

Distance: Spot
Mode Max,Min,Lock


  • National Lab Standard Traceable
  • Certificate of Calibration Available (COC Optional)
  • IR-SoC technology (Infrared System on Chip) and Batch Calibration technology drive the dimensions and cost to the lowest limits
  • 2in1, Infrared + Thermocouple = Instant + Accurate
  • Adjustable Emissivity
  • Max; Min and Lock modes
  • Retractable probe
  • Dual Display
  • Auto Power Off

Available Packages

ME1 (Metal Box)

Packing List

One set includes:

  • Infrared thermometer
  • 1 CR2032 battery
    (inside the thermometer)
  • 1 user manual
  • Metal box with foam inlay
  • White box (paper)
  • COC (optional)

72 box/carton
Carton size:
436*406*390 mm (2.44 cube ft)
N.W.:16.50kgs; G.W.:17.47kgs

BL1 (Blister)

Packing List

One set includes:

  • Infrared thermometer
  • 1 CR2032 battery
    (inside the thermometer)
  • 1 user manual
  • Blister with inlay card
  • COC (optional)

42 box/carton
Carton size:
578*315*454 mm (2.91 cube ft)
N.W.:6.08kgs; G.W.:8.32kgs

CL1 (Color Box)

Packing List

One set includes:

  • Infrared thermometer
  • 1 CR2032 battery
    (inside the thermometer)
  • 1 user manual
  • Color box (paper)
  • COC (optional)
  • Bubble bag (for protection)

100 box/carton
Carton size:
395*412*373 mm (2.14 cube ft)
N.W.:11.09kgs; G.W.:12.71kgs

WH1 (White Box)

Packing List

One set includes:

  • Infrared thermometer
  • 1 CR2032 battery
    (inside the thermometer)
  • 1 user manual
  • White box (paper)
  • COC (optional)
  • Bubble bag (for protection)

100 box/carton
Carton size:
395*412*373mm (2.14 cube ft)
N.W.:11.09kgs; G.W.:12.7kgs

WS1 (Holster)

Packing List

One set includes:

  • Infrared thermometer
  • 1 CR2032 battery
    (inside the thermometer)
  • 1 user manual
  • Holster
  • White box (paper)
  • COC (optional)
  • Bubble bag (for protection)

100 box/carton
Carton size:
510*434*373 mm (2.92 cube ft)
N.W.: 12.55kgs; G.W.:14.05kgs

Available Colors

Color: WWG1
(UC=White, RC=White, Key=Gray)

Color: WWB1
(UC=White, RC=White, Key=Blue)

General Description

Infrared thermometers with built in contact type thermocouple probe.
This dual sensors thermometer can be very useful while both non-contact and contact temperature measurements are required.
Some models with food grade requirement are specially designed for food service application.

Anti-Thermal Shock Feature

IRT (Infrared Thermometer) is an instant magic.
When you take it from outdoor to indoor (or from one room to another room), you have to wait for 30 minutes. "30 minutes" is absolutely not "instant". Most of IRT suffered from such flaw.
By Many-year-experience in high precision clinical infrared thermometer (in EN12470, Error due to 10degC thermal shock must be less than 0.2°C) Finite Element Analysis of heat transfer; ZyTemp had overcome this barrier.
A simple test, according to the test method described in EN12470 Paragraph 7.6 Testing for compliance of accuracy under changing environmental conditions, clearly shows that ZyTemp TCT1 performs better than competitor's model, which usually has a higher price than TCT1.
Error of M model can reach 1.6°C and require 30minutes to stabilize, while TCT1 is only 0.7°C and stabilize in 7minutes.
Since a test can be easily performed, you don't have a standard & stable blackbody:
Setup a very stable target . Hint: use a large milk bottle (2 liter), fill the bottle with water, wait for 3 hours to stabilize, that's a very stable target, with thermal time constant about 100 minutes
Put the IRT outdoor (say 15°C) for 1 hour.
Bring IRT back to indoor (say 25°C),
Measure the temperature of the Bottle by the IRT every minute.
You will find the reading drift within 30 minutes unless it's a ZyTemp Anti-Thermal Shock IRT: TCT102 or TCT103.

ThermaTwin General Description

ThermaTwin Overview
ThermaTwin is the ideal multi-purpose tool for temperature measurements. It contains two reliable sensors:

  • An infrared sensor made through a micro machining thermopile process.
  • A Teflon-coated stainless steel probe, which acts as a thermocouple.

This dual function tool fulfills most temperature measurement requirements. The non-contact IR sensor can be used for instantaneous, hard-to-reach, and surface-oriented measurements. The thermocoupler functions as the dual of the former: accurately measuring subsurface temperatures.

More Sensors at Lower Cost
ThermaTwin implements an innovative technology, placing integrating two sensors seamlessly into one package. They share the same preamplifier, precision analog to digital converter (ADC), CPU, and LCD. Thus, making the cost of the thermometer the same as if there were only one sensor.

One can discover the emissivity of an object with the ThermaTwin. Simple use the ThermaTwin's metal rod to touch that object to get the (contact) temperature, then use the non-contact sensor to obtain that surface temperature. Later, adjust the emissivity until the thermometer displays the same temperature. Now you know the correct emissivity of the object.

ThermaTwin offers several different kinds of probes:

  • Penetration: for insertion into the interior of an object
  • Needle: a sharp penetrating probe that produces a fast response
  • Air
  • Liquid: similar to penetration, but with a round tip
  • Surface

The ThermaTwin is designed for many types of applications:

  • Hazard Analysis and Critical Control Point (HACCP)
  • Heater Ventilation and Air Conditioning (HVAC)
  • Science lab
  • Classroom
  • Kitchen

The Certificate of Calibration for the ThermaTwin is available upon request.

Available Probes: The hot junction is grounded to the sheath.

Probe Type TTC Response Time Available
Photo Type Description In Water In Water
(Food Grade)
In Air In Water In Water
(Food Grade)
In Air
LQ Liquid NA NA 30 NA NA 69 103
ND Needle,Diameter
Tip Diameter < 2.2mm
2 1.5 30 4.5 3.5 69 102
Penetration Blunt 6 4.2 30 13.8 9.7 69 102/103
PN Penetration type 6 4.2 30 13.8 9.7 69 102/103
AR for Air temperature measurement NA NA TBD NA NA TBD 103

Note: Relative Price is compared against PB type (our standard type)
TTC= Thermal Time Constant [sec] Response Time(90%)= TTC*2.3

Response Time TSR (Test Report)

Typical Error of Reading

A typical error of reading is not a simple figure, it's a function of Tobj (object temperature) & Tamb (ambient temperature)
Because Infrared Thermometer is a "Relative" measurement instrument. (It compares the Tobj against Tamb)
So, the error has a minimum value when Tobj ~ Tamb,
that is when you measure something close to ambient temperature.
For ZyTemp, this minimum value (dTabs) = 0.15°C / 0.27°F ,
usually, our competitor is larger than 0.2°C / 0.36°F
At higher or lower temperature, there is a Gain Error, usually 2%.
Q: Since the spec is "+/-2°C or 2%", is IRT most accurate at Tobj=0°C?
A: No, as described as above, IRT use a "Relative" measurement, IRT is most accurate at Tobj=Tamb,
In other words, when you point the IRT at a "near room temp" object, it will be very accurate.

Q: Can I calibrate my IRT by pointing it to a wall (25°C)?
A: No, even though the Gain run away, the IRT still shows 25°C, you have to use a "Temperature Different From Tamb",
(ex. 0°C or 50°C)? 0°C is the most available temperature "standard", for ordinary user.

Certificate of Calibration

Founded in July 2000, ZyTemp belongs to world-class Infrared Technology-oriented thermometer manufacturer - Radiant Innovation Inc. and become a premier provider of infrared temperature measurement devices. Originally started from a professional team of engineers specializing in infrared thermometry, this company is now emerging as worldwide well-known manufacturer of infrared thermometers (IRT).

Copyright (c) 2000-2019 RADIANT INNOVATION INC.
All Rights Reserved.