Fluke Calibration 1523 Handheld Thermometer Readout

  • Fluke Calibration 1523 Handheld Thermometer Readout | Fluke
  • Fluke Calibration 1523 Handheld Thermometer Readout | Fluke

Key features

Make accurate, consistent measurements… anywhere.

You need accuracy for compliance, product yields, energy savings, and consistent results. The 1523 uses current reversal, a technique used in high-end instruments that eliminates thermal EMFs, for precision temperature measurements. Specifications are guaranteed from -10 °C to 60 °C ambient. Special precision resistors and a highly stable reference voltage source keep the 1523 accuracy virtually insensitive to environmental temperature.

Like all Fluke handheld tools, the 1523 Reference Thermometers endure rigorous testing in temperature extremes and under harsh conditions of vibration, so you can take them anywhere you need to go.

An optional magnetic hanger allows you to hang the thermometer for easy viewing while freeing your hands to focus on the job.

INFO-CON connectors ensure correct temperature conversion

Inside the INFO-CON, a memory chip keeps calibration information for the attached probe. Simply plugging in the probe uploads the information to the readout, ensuring the correct temperature conversion for accurate, hassle-free measurements.

Probes may be locked by password to specific channels and readouts for security or for system calibration traceability. Plug any thermocouple with mini-thermocouple jacks into an optional universal thermocouple adapter for convenient measurement. Each thermocouple adapter or standard connector supports reference junction compensation (RJC) with its own internal precision thermistor.

Monitor trends in the lab or in the field

See trends graphically on the 1523 thermometer’s 128x64-backlit LCD display. You can change the graph’s resolution at the touch of a button. Now it’s easy to see when the temperature is stable, without statistics or long delays, or monitor processes over time to verify correct operation.

Document on demand up to 25 readings and associated statistics for easy retrieval. You can view the data through the display or by uploading it to a PC via RS-232 connection and 9940 software, included free. To monitor and log more data over time, use a PC and optional LogWare II software.

RS-232-to-USB adapters are available for those who prefer USB connectors. Battery power lasts at least 20 hours on three AA batteries, or use the dc power adapter for extended periods of measurement. Power saving features can be enabled or disabled for longer battery life or greater convenience.

Two models let you make the best choice for your application

The 1523 Reference Thermometer is a versatile single-channel thermometer that measures, graphs and records three sensor types with one tool. Support for PRTs/RTDs, thermocouples, and thermistors provides flexibility to choose the right probe for the job.

The new 1524 Reference Thermometers help you do twice the work in half the time. Two channels and three sensor types and high-speed measurement make you more productive and make model 1524 the one reference thermometer you need to own. It has all the features of the 1523, and it’s a data logger too. A real-time clock and memory for 15,000 time and date stamped measurements mean everything you are going to need is in this package. Log up to three times per second, or once every hour or other options in between. Download the data to a PC for analysis when you need it.


Calibration, loop checking, plant startup, troubleshooting, maintenance, and repair are some of the varied duties that need a 1523 thermometer. Use it for a handy temperature reference in baths, dry-block calibrators, thermowells, clean rooms, engines, heat exchangers, furnaces, freezers, or anything else that must be calibrated, checked, or maintained.

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Product overview: Fluke Calibration 1523 Handheld Thermometer Readout

Measure, graph and record three sensor types with one tool

The 1523 Reference Thermometers from Fluke’s Hart Scientific Division measure, graph, and record PRTs, thermocouples, and thermistors. These thermometer readouts deliver exceptional accuracy, wide measurement range, logging, and trending, all in a handheld tool you can take anywhere.

The 1523 lets you handle field applications, laboratory measurements, and data logging with ease. With the dual channel measurement capabilities of the model 1524, you can do twice the work in half the time.

Three sensor types

  • PRTs: –200 °C to 1000 °C
  • Thermocouples –200 °C to 2315 °C
  • Precision thermistors: –50 °C to 150 °C


  • PRTs: up to ±0.011 °C
  • Thermocouples: ±0.24 °C for J,K,L,M
  • Precision thermistors: ±0.002 °C

Fast mode

  • PRTs: 0.45 seconds per sample
  • Thermocouples: 0.3 second per sample
  • Precision thermistors: 0.3 seconds per sample

Two models

  • 1523: Single channel standard model; memory for 25 readings and statistics
  • 1524: Two channels; memory for logging 15,000 measurements; real-time clock for time and date stamps

Graphical display

  • 128x64 backlit LCD graphic display
  • Plot and scale trends in real time
  • Simultaneous dual channel readings

Specifications: Fluke Calibration 1523 Handheld Thermometer Readout

Input channels1
Logging25 readings with statistics
Sample interval
1 second
Sample interval (fast mode)0.3 seconds (see technical manual for details)
Sensor typesPRTs, RTDs, Thermistors, and Thermocouples
Thermocouple typesC,E,J,K,L,M,N,T,U,B,R,S
Operating temperature-10°C to 60°C (Best accuracy 13°C to 33°C)
Power requirements3 AA alkaline batteries
Size96 x 200 x 47 mm
(3.75 x 7.9 x 1.86 in)
Weight0.65 kg (1.4 lb)
Environmental conditions for best accuracy13°C to 33°C
Millivolt range and accuracy–10 mV to 75 mV ±(0.005% + 5 μV)
Resistance range and accuracy0 Ω to 400 Ω ±(0.004% + 0.002 Ω)
200 Ω to 50 kΩ ±(0.01% + 0.5 Ω)
50 kΩ to 500 kΩ ±(0.03%)
Temperature coefficient, voltage (–10°C to 13°C , +33°C to 60°C)±(0.001%/°C + 1 μV/°C)
Temperature coefficient, resistance (–10°C to 13°C , +33°C to 60°C)0.0008%/°C + 0.0004 Ω (0 Ω to 400 Ω)
0.002%/°C + 0.1 Ω (0 Ω to 50 kΩ)
0.06%/°C + 0.1 Ω (50 kΩ to 500 kΩ)
Excitation current, resistance1 mA (0 Ω to 400 Ω)
10 μA (0 Ω to 50 kΩ)
2 µA (50 kΩ to 500 kΩ)
Thermocouple Equivalent Temperature Accuracies (readout only)
Type B±0.85°C from 600°C to 800°C
±0.68°C from 800°C to 1000°C
±0.57°C from 1000°C to 1800°C
Type C±0.32°C from 100ºC to 550°C
±0.71°C from 550°C to 2300°C
Type E±0.52°C from -200°C to 0°C
±0.22°C from 0°C to 950°C
Type J±0.52°C from -200°C to 0°C
±0.23°C from 0°C to 1200°C
Type K±0.61°C from -200°C to 0°C
±0.24°C from 0°C to 1370°C
Type L±0.36°C from -200°C to 0°C
±0.23°C from 0°C to 1370°C
Type M±0.26°C from -20°C to 0°C
±0.25°C from 0°C to 400°C
±0.22°C from 400°C to 1400°C
Type N±0.72°C from -200°C to 0°C
±0.28°C from 0°C to 1300°C
Type R±1.09°C from -20°C to 0°C
±0.97°C from 0°C to 500°C
±0.49°C from 500°C to 1750°C
Type S±1.05°C from -20°C to 0°C
±0.95°C from 0°C to 500°C
±0.56°C from 500°C to 1750°C
Type T±0.60°C from -200°C to 0°C
±0.25°C from 0°C to 400°C
Type U±0.54°C from -200°C to 0°C
±0.24°C from 0°C to 400°C
Accuracies are based on internal Reference Junction Compensation. Refer to Technical manual for equivalent accuracies with an external reference junction.
Accuracies with Selected Probes (±°C)
-200°C5616-12: 0.014
5615-6: 0.025
5627A-12: 0.027
5610-9: n/a
0°C5616-12: 0.021
5615-6: 0.021
5627A-12: 0.049
5610-9: 0.009
100°C5616-12: 0.027
5615-6: 0.028
5627A-12: 0.065
5610-9: 0.009
300°C5616-12: 0.040
5615-6: 0.043
5627A-12: 0.103
5610-9: n/a
420°C5616-12: 0.050
5615-6: n/a
5627A-12: 0.130
5610-9: n/a
Includes readout accuracy, probe calibration, and probe drift
PRT Equivalent Temperature Accuracy (readout only)
Thermistor Equivalent Temperature Accuracy (readout only)

Models: Fluke Calibration 1523 Handheld Thermometer Readout

Fluke 1523
Fluke Calibration 1523 Handheld Thermometer Readout
1 Channel
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Fluke 1523-P1
Fluke Calibration 1523-P1 Handheld Thermometer Readout
5616 PRT (–200°C to 420°C, 100 ohm (1/4 x 12 inch))
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  • Universal TC INFO-CON Connector
  • TPAK
  • Case
Fluke 1523-P2
Fluke Calibration 1523-P2 Handheld Thermometer Readout
5628 PRT (–200°C to 660°C, 25 ohm (1/4 x 12 inch))
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  • Universal TC INFO-CON Connector
  • TPAK
  • Case
Fluke 1523-P3
Fluke Calibration 1523-P3 Handheld Thermometer Readout
5627A PRT (–200°C to 420°C , 100 ohm (12 x 1/4 inch))
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  • Universal TC INFO-CON Connector
  • TPAK
  • Case

Resources: Fluke Calibration 1523 Handheld Thermometer Readout