Isotech TTI-10 Handheld Thermometer



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  • Input channels two: 100 Ohm PRT, EN 60751 (Pt100), four wire
  • Temperature range: -328 to 1562°F (-200 to 850°C)
  • Units: °C, °F and Ohms
  • Accuracy: ±0.012°C
  • Records average, min, max over 4000 measurements
  • Adjustable: 1 second to 30 minutes

The Isotech TTI-10 Handheld Thermometer is a high accuracy handheld temperature indicator with two platinum resistance thermometer inputs. The high precision makes the instrument particularly suitable as a portable reference thermometer to use alongside Isotech temperature calibrators such as the Fast-Cal, Isocal-6 and Dry Block ranges. It is also suited for high accuracy measurements in industrial and scientific applications.

TTI-10 brings laboratory level performance of up to 10mK (0.01°C) and resolution up to 0.001°C in a portable handheld instrument. Battery life is typically 20 hours from a 9V PP3 battery and a protective rubber boot offers protection in field use.

The instrument can capture the minimum, maximum and average values over up to 4000 measurements with a logging rate selectable in the range of 1 second to 30 minutes.

The TTI-10 has an easy to use "learning calibration mode" that allows the TTI-10 to be system calibrated with a Platinum Resistance Thermometer simply by comparing it to a calibrated standard thermometer, no need to calculate coefficients or data, simply enter the reference probe temperature or temperatures and the TTI-10 does the work for you.

The USB interface allows connection to Isotech Cal Notepad software with its charting and logging features.

TTI-10 supports Isotech Semi Standard Platinum Resistance probes with system uncertainties (probe and instrument) as low as 20mK. We recommend the 935-14-61 and 935-14-16 probes detailed below and have special calibration deals available. Other probes and ranges are available, refer to Semi Standards – Platinum Resistance Thermometers in catalogue.


Isotech 935-14-116/TTI Semi Standard Pt100
Semi standard Pt100, temperature range -148 to 842°F (-100 to 450°C)
Isotech 935-14-61/TTI Semi Standard Pt100
Semi Standard Pt100, temperature range: -50°C to 250°C
Isotech 931-22-101 Carrying Case
Carrying case for the TTI-10


Please consider these optional accessories.

Isotech Semi-Standard Platinum Resistance Thermometers
PRTs designed for optimum performance

Application Notes

Here's how some of our customers used this product.

Temperature Probe Calibration Using Liquid Bath or Dry Block Calibrators

The Background: Our customer is an industrial manufacturer that uses a large number of temperature sensors in various applications and needs a way to calibrate them.

The Problem: The customer does not currently have an effective way to test the sensors for accuracy. The sensors they use include both thermocouples and RTDs with varying accuracy and style. They currently have both dry blocks and liquid baths to calibrate the sensors but the accuracy of these methods does not meet the customer’s requirements.

The Solution: We recommended the Isotech TTI-10 a high accuracy handheld temperature indicator with two platinum resistance thermometer inputs. The customer can continue to use their dry blocks and liquid baths as a source of temperature while using the TTI-10 and an SPRT as a reference against the probe under test. With this, the customer is able to achieve far greater accuracy than by using the dry blocks and liquid baths alone.