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Customer Reviews

Fluke 1523 Reference Thermometer

Model: 1523 | Order No: 1523-156

Measures, graphs, and records PRTs thermocouples, and thermistors, making this reference thermometer ideal for field applications, laboratory measurements, and data logging. Additionally, this instrument provides high accuracy, a wide measurement range, logging, and trending.

$2,199.00 USD

3 to 4 Weeks
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Fluke 1523 Offers


  • Three sensor types (PRTs, thermocouples, and precision thermistors)
  • Fast mode
  • Backlit LCD graphic display
  • Plot and scale trends in real time
  • Simultaneous dual channel readings
  • High accuracy

Make accurate, consistent measurements… anywhere.

This instrument uses a technique called current reversal in high-end instruments to eliminate thermal EMFs, for precision temperature measurements. Special precision resistors and a highly stable reference voltage source maintain this reference thermometer's accuracy virtually insensitive to environmental temperature. Additionally, it can endure rigorous testing in temperature extremes and under harsh conditions of vibration, allowing professionals to take them anywhere they need to go.

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 128 x 64-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.


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

Fluke 1523 Specifications

Input Channels 1
Resolution PRTs and thermistors: 0.001°
Thermocouples: 0.01°
Logging 25 readings with statistics
Sample Interval (Normal) 1 second
Typical Sample Interval (Fast Mode) 0.3 seconds
Sensor Types PRTs, RTDs, thermistors, and thermocouples
Thermocouple Types C, E, J, K, L, M, N, T, U, B, R, S
Statistics Maximum, minimum, average, standard deviation
Trending Scale: ±18°F (10°C), ±1.8°F (1°C), ±0.18°F (0.1°C), ±0.018°F (0.01°C), 10 minutes of real-time data
Power Requirements 3 x AA alkaline batteries, 12 V dc universal power supply
Computer Interface RS-232, 9940 I/O ToolKit software included
Environmental Conditions for Best Accuracy 55.4 to 91.4°F (13 to 33°C)
Millivolt Range and Accuracy 10 to 75 mV, ± (0.005% + 5 µV)
Internal Reference Junction Compensation ±0.36°F (±0.2°C)
Resistance Range and Accuracy 0 to 400 Ω ± (0.004% + 0.002 Ω)
200 Ω to 50 kΩ ± (0.01% + 0.5 Ω)
50 to 500 kΩ ± (0.03 %)
Temperature Coefficient, Voltage ±(0.001%/°C + 1 mV/°C)
Temperature Coefficient, Resistance 0.0008%/°C + 0.0004 Ω (0 to 400 Ω)
0.002%/°C + 0.1 Ω (0 Ω to 50 kΩ)
0.06%/°C + 0.1 Ω (50 to 500 kΩ)
Excitation Current, Resistance 1 mA (0 to 400 Ω)
10 µA (0 Ω to 50 kΩ)
2 µA (50 to 500 kΩ)
Dimensions 3.75 x 7.9 x 1.86" (96 x 200 x 47 mm)
Weight 1.45 lbs (0.65 kg)
Safety EN61010-1:2001, CAN/CSA C22.2 No. 61010.1-04
Click here for complete specifications on the Fluke 1523

What's included with the Fluke 1523

  • Thermometer
  • NIST Traceable Certificate of Calibration
  • Cable
  • ToolKit Software
  • Power Supply
  • Users Guide
  • CD-ROM (Contains Technical Manual)


Click on a category to view a selection of compatible accessories with the Fluke 1523 Reference Thermometer.

Fluke 1523-CASE Carrying Case for Fluke Reference Thermometers 1523-CASE
Carrying Case for the 1532-156 & 1524-156 Thermometers.
$500.40 USD

was $556.00

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Fluke 2373-LPRT Lemo to Mini Grabber Adapter, PRT 2373-LPRT
Adapter for the Fluke 1532-156 and 1524-156 Thermometers.
$290.70 USD

was $323.00

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Fluke 2373-LTC Lemo to Universal T/C Adapter 2373-LTC
Adapter for the Fluke 1532-156 and 1524-156 Thermometers.
$290.70 USD

was $323.00

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Fluke 2384-P Spare PRT Smart Connector, Grey Cap 2384-P
PRT Smart Connector for the Fluke 1532-156 and 1524-156 Thermometers.
$112.50 USD

was $125.00

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Fluke 5610-9-P Thermistor Probe, 1/8 x 9" SST 5610-9-P
Thermistor Probe for the Fluke 1532-156 and 1524-156 Thermometers.
$987.30 USD

was $1,097.00

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Fluke 5615-12-P PRT Probe, 100Ω, -200/420°C, 1/4 x 12" 5615-12-P
PRT Probe or the Fluke 1532-156 and 1524-156 Thermometers.
$1,350.00 USD

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Fluke 5615-6-P PRT Probe, 100Ω, -200/300°C, 3/16 x 6" 5615-6-P
PRT Probe or the Fluke 1532-156 and 1524-156 Thermometers.
$1,350.00 USD

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Fluke 5627A-12-P Industrial RTD Probe, 12 x 1/4" O.D. 5627A-12-P
Industrial RTD Probe for the Fluke 1532-156 and 1524-156 Thermometers.
$882.90 USD

was $981.00

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Fluke 9935-S LogWare II Software 9935-S
Single user software for the Fluke 1532-156 and 1524-156 Reference Thermometers.
$913.50 USD

was $1,015.00

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Customer Reviews for the Fluke 1523