RTD Thermometers



Precision Thermometers for Laboratory, Medical and Industry



Doric 450- RTD Thermometer   $ 295.00


Doric 450-TH ThermometerThe Doric 450 Series digital thermometers are among the most accurate, reliable, and convenient handheld instruments ever developed. Using a unique, patented noise reduction circuit, the Series 450 achieves the high repeatability and accuracy of many line-powered bench top units in a handheld instrument.

A custom-designed dual integrated circuit set gives you a single instrument with wider temperature ranges, higher resolutions, and longer performance than most other handheld thermometers. Data hold freezes the displayed reading for easy viewing away from difficult measurement locations.

Battery life is unsurpassed, with a single 9V battery providing more than 1200 hours of use. An externally available zero pot, conveniently located at the back of the instrument, lets you match ice point calibrations to specific probes for even greater system accuracy.


The 450 RTD input is a 3-pin TA3M Connector.


The 450 is available in J, K, T or E Thermocouple, RTD, and Thermistor configurations. Please specify when ordering.

Hart Scientific 1521 and 1522 Ultra Precision Handheld Thermometers    $ 1225.00

Specifications  1521 Manual  1522 Manual

Hart Handheld ThermometerThe Hart Scientific Series of Ultra-Precision Handheld Thermometers provide laboratory accuracy in a convenient handheld format.  Hart has established itself as the clear product leader for thermometer readouts. Our pattern of offering more power and more versatility for less money is indisputable.  Hart offers the two most powerful handheld thermometers in the world.

The Models 1521 and 1522 are the first standards thermometers to fit into a battery-powered handheld package. Theyre as accurate as 0.005C!  Fitting easily into your hand and weighing only 1 pound (0.4 kg), these thermometers can go anywhere.  And when they get there, you can have total confidence in the accuracy of your measurements.  The 1522 adds the power of a full data logger, with memory to hold 10,000 readings.

The 1521 and 1522 read both Pt-25 and Pt-100 RTDs as well as thermistors.

PRTs and RTDs, with their wide temperature ranges and stabilities, have long been favored as temperature standards. From 200C to 100C, the 1521 reads PRTs accurately to 0.025C. Even at 800C these are high-precision readouts, accurate to 0.1C.

Probes attach to the 1521 and 1522 using Harts own INFO-CON connector. The INFO-CON (partially based on U.S. Patent 5,857,777) allows you to change the probes you use without requiring you to reprogram your readout. A memory chip in the INFO-CON stores all the critical information about your probe, including its serial number, recall date, and calibration constants.

Laurel L-series Universal Input Panel Meter    $ 220.00


Laurel L-series TC MeterThe Laurel L-Series Universal Input Panel Meter provides 4 full digits of temperature readout for most common TCs.  The Laurel digital panel meter will display temperature in C or F to with selectabel 1 or  0.1 resolution. The L-series offers optional output relays, analog out and communications interfaces.  RS-232, 422 and 485 as well as Modbus protocols are available. 

You can directly connect the L-series to most popular process sensors. These include Thermocouples, RTDs, 4 - 20mA loop Transmitters and DC signals. millivolt, and others.  Scaling in engineering units is standard.  The 6 linearized thermocouple ranges include K, T, J, N, R and S as well as RTD's. TC inputs have automatic cold junction compensation (CJC) with up-scale sensor burnout detection. . Peak function is standard.  An excitaation power supply is standard.  Line power: 85-264 VAC power.  Optional low voltage DC power is available.

Doric 400 Series Multi-Input TC Thermometer   base $ 439.00 ($ 539.00 for 5 input model)

Specifications     Manual

Photo of Doric 400 SeriesThe Doric 400 Series digital thermometers feature large 0.8" (20mm) LED display characters which can easily be seen from across the room, and at all viewing angles. The case is solid die-cast aluminum - rugged enough to withstand the most hostile environments.

Temperature resolutions of 1, 0.1(410 Series).

Two models, the 402A and the 412A provide the ability to switch between five inputs of a common type (e.g., type K thermocouples) cutting the costs of measuring and displaying multiple sensors. A row of five pushbutton switches, accessible on the front panel, permits easy switching between sensor readings. A screw terminal is located at the rear of the instrument to which up to five sensors can be attached.

The 400 is available in thermocouple, RTD, and thermistor configurations.

Doric 600 Series TC Thermometer   base $ 599.00

Specifications     Manual
Doric 600 Series

The Doric 600 Series digital thermometers are among the most accurate, reliable, and convenient benchtop  instruments ever developed. Using a unique, patented noise reduction circuit, the Series 600 achieves the high repeatability and accuracy you would expect.

A custom-designed dual integrated circuit set gives you a single instrument with wider temperature ranges, higher resolutions, and longer performance than most other handheld thermometers.


Also available in multi-channel configurations, and with alarms.

The 600 is available in thermocouple, RTD, and thermistor configurations.

Multi-RTD Selector Switch

Specifications, Selection Guide and Pricing

Available in 2 - 40 position switches.  Two or Three Wires.

Insulation Resistence: 20 Mohm at 300 Vdc
Contact Resistance: 0.004 ohm or less.

Also Available: Pistol grip handle retrofit kit; specify OSW-PG and switch

Hart Scientific 1502A  Ultra-Precision RTD Thermometer   $ 1860

Specifications   Manual

One of Harts best-selling products is the Tweener thermometer, and theres a reason. No other company, not one, has a thermometer that comes close to the performance and features of the Tweener for anywhere near its price.

The Model 1502A Tweener features accuracy up to 0.006C.  In addition, it reads both 100-ohm and 25-ohm probes, has a resolution of 0.001C across its entire range and is the smallest unit in the industry. It also has an optional battery pack for completely portable operation.

Each Tweener is programmable to match any probes constants for maximum linearity and accuracy. All probe constants and coefficients are programmed through simple, front-panel keystrokes. Temperature is displayed in C, F, K, or resistance in ohms.

The 1502A accurately measures the resistance of the probe and then converts the resistance to a temperature value using its built-in algorithms.

For convenience, the 1502A reads the common industrial grade IEC-751 or 385 ALPHA RTD without any programming. Enter the actual R0 and ALPHA of the individual probe for increased accuracy. For maximum accuracy, use the ITS-90 formulas. The Tweener accepts the subranges 4 and 6 through 11.

ITS-90 formulas reside in its firmware. If your probe has been calibrated for any of the subranges of the ITS-90, you simply enter the coefficients directly into the Tweener.

Each thermometer comes complete with an RS-232 interface for automation of temperature data collection, calibrations, or process control functions. An IEEE-488 interface is available as an option.

The 1502A is calibrated digitally using the front-panel buttons. You never have to open the box to calibrate it. This calibration protocol further reduces the cost of the 1502A. It goes where you go and works the way you want it to.

Want more? There are two more Tweeners for specific applications, including the Model 1503 High Temperature PRT Readout and the Model 1504 Thermistor Readout.


With our Model 9934 LogWare, all three Tweener models may be used for real-time data acquisition. Collect data and analyze it graphically or statistically. Additionally, Tweeners may be used as reference thermometers with our MET/TEMP II software. 

Battery Option

If you want freedom from AC power in the field or on the plant floor, order Model 2502 and well install a DC power board in your Tweener. Then you can connect your own 12-volt DC power or order Harts 9313 Battery Pack. Our battery gives you three to eight hours between charges. It includes a charger and a nylon pouch with a belt clip.

Calibration Choices

Each Tweener and its accompanying probe (sold separately) have their own individual calibration reports. Overall system error can be calculated from the individual errors, rendering the added cost of system data unnecessary. However, for those requiring it, system data is available at two or more temperatures of your choice. (See Calibration Model 1929-X )

Hart Scientific 1529 4 Channel Precision Thermometer  base $ 4295

Specifications   Manual

1529Four channels for PRTs, thermistors, and thermocouples  Displays eight user-selected data fields from any channel.  Logs up to 8,000 readings with date and time stamps.  Battery provides eight hours of continuous operation. 

Hart’s Model 1529 Chub-E4 Thermometer gives you four channels, three major sensor types, lab-quality accuracy, and a ton of great features, all at a price you’ll love. 


The Chub-E4 has four inputs for reading four different sensors simultaneously, and we’ll configure those inputs in any of three different ways according to your preference. Choose four channels of thermocouple inputs, four channels of PRT/thermistor inputs, or two channels of each. With this thermometer, reading thermocouples, PRTs, and thermistors accurately from the same device is no problem. 

100-ohm or 25-ohm PRTs and RTDs are read using ITS-90, IEC-751 (DIN), or Callendar-Van Dusen conversion methods. Typical accuracies include 0.004C at 100C and 0.009C at 100C.

PRTs and thermistors connect easily to the 1529 using Hart’s patented mini DWF connectors, which accept bare wire, spade lug, or mini banana plug terminations. Thermocouples connect using standard or miniature terminations. Measurements are taken each second and can be taken simultaneously or sequentially. A special high-speed mode allows measurements on one channel to be taken at the rate of 10 per second. 


If you think three sensor types and four inputs sounds versatile, wait until you see the display panel on the Chub-E4. Displaying measurements in °C, °F, K, ohms, or millivolts and choosing temperature resolution from 0.01 to 0.0001 are just the beginning. 

You can also select any eight items from our long list of displayable data fields to view on-screen. Choose statistical functions such as averages, standard deviations, and spreads; choose probe information such as probe type and serial number; choose T1-T2 functions using inputs from any two channels; or choose utility functions such as the date, time, and battery power level. You can even save up to 10 screen configurations for easy recall. 

The push of a single front-panel button also brings up a simple menu system to easily guide you through all the internal setup and memory options of the 1529. Probe coefficients, sample intervals, communication settings, password settings, and a host of other functions are all easily accessible. 


The memory and communications capabilities of the Chub-E4 make it perfect for benchtop thermometry, on-site measurements, lab calibration work, and remote data logging. Optional software packages from Hart make this one of the most powerful thermometers on the market. 

With battery power and memory to store up to 8,000 measurements (including date and time stamps) at user-selected intervals, the 1529 has plenty of data logging capability. Store 100 individual measurements or any number of automatic log sessions (up to 8,000 readings), each tagged with an identifying session label. Fourteen different logging intervals may be selected, from 0.1 second to 60 minutes.   

With Hart’s 9935 LogWare II, data may be quickly downloaded to your PC for complete graphical and statistical analysis. Separate log sessions may even be automatically downloaded to separate files based on session labels. With this software, the 1529 can even be used for real-time data logging. Log four channels at once directly to your PC with virtually no limit to the number of data points you take. You can analyze data, set alarm events, and even set delayed start and stop times. 

With MET/TEMP II software, the Chub-E4 may be integrated into a completely automated calibration system. Use one input for your reference thermometer and calibrate up to three other thermometers automatically. An RS-232 port is standard on every unit. An IEEE-488 port is optional. 

Additional Information:    RTD Probes   Applications Notes

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Note:  Prices shown are for reference only, and may change without notice.  Contact Advanced Industrial Systems, Inc. for firm price quotations.

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Last modified: Wednesday October 23, 2013.