Leupold LTO Quest Thermal Viewer Review

Leupold LTO Quest Thermal Viewer Review

A Leupold’s LTO-Quest is a robust handheld thermal device with a dual-mode and 300-lumen flashlight with which you can detect heat signatures out to 300 yards. It can make all the difference in tracking downed game or scouting.

Leupold’s LTO-Quest thermal viewer can detect operating temperatures from -4F to 140F. This device startup in less than 3 seconds. The built-in camera takes over 2000 images on a micro SD card slot and has eight color palette options that allow use in any lighting conditions.

The rugged and rubberized body is small enough to fit in your pocket. The LTO quest thermal imager features a 2.4-inch display with a 15Hz refresh rate that provides precise temperature readings of all objects scanned within a 20-degree field of view. It can also use as a valuable tool to measure the heat efficiency of other mechanical devices.

Leupold LTO Quest Thermal Viewer

High display resolution:

This thermal viewer boasts a 390×390 resolution display that can display images with high clarity and excellent contrast. It can make it easy to identify a target in little to no light environments. This thermal imager runs at a 25hz refresh rate that is refreshers the image 25 times per second. It can produce images that are similar to the real-world movement that eliminates any jerks.

Arctic Silver 5 Thermal Paste


  • Thermal Sensor: 320×240
  • Detection Distance: 750 yards
  • Frame Rate: >15 Hz
  • Flashlight: Variable power 300 lumen LED
  • Display: 2.4″ LCD
  • User Interface: 3 Button navigation
  • Color Palettes: 8 Selectable options

Thermal imagery:

The Leupold LTO Tracker HD comes with a super-sensitive 320×240 infrared sensors. This viewer can identify the object from a distance of 150 yards, and it makes it easy for a hunter because you don’t need to be too close to an animal to take a shot.

Thermal imagery is one method of improving the visibility of things in a dark environment with detecting the infrared radiation. The typical application of this unit is border security. It is mostly used for night vision technologies that can be produced as an image based on that information.


There are four types of Leupold’s LTO-Quest thermal viewer available,

1. LTO-Quest
2. LTO-Quest HD
3. LTO-Tracker2
4. LTO-Tracker2 HD

1. LTO-Quest:

It is a thermal viewer and a powerful handheld thermal device.
The LTO-Quest is a dual-mode with a camera and a 300-lumen flashlight. With this device, you can detect heat signatures up to 300 yards, and it makes more difference in scouting or tracking downed game.

Leupold LTO Quest Thermal Viewer

2. LTO-Quest HD:

The Leupold Thermal Optic Quest HD thermal viewer is a great handheld thermal tool, a dual-mode, a camera and a 300-lumen power flashlight. This device, you can identify heat signatures up to 300 yards, and it makes more variety in tracking or scouting downed game.

Leupold LTO Tracker HD

3. LTO-Tracker2:

LTO-Tracker2 is compact, and it shows you the heat signature of game, blood trails, and more—day or night. The LTO-Tracker 2 features new Beacon mode which allows you to quickly recalibrate the screen to improve daytime use.

Leupold LTO Tracker 2

4. LTO-tracker2HD:

LTO-tracker2 HD features new Beacon mode which allows you to quickly recalibrate the screen to improve daytime use. The Leupold LTO-Tracker 2 HD is the subsequent evolution of thermal, and its objects that come with a similar heat signature to their backgrounds.

Leupold LTO Tracker 2 HD

Comparison Table: Quest Vs Quest HD Vs Tracker2 Vs Tracker2 HD

Number of color palettes8866
Resolution display390×390390×390390×390390×390
Detection distance300-yards400-yards600-yards750-yards
100% WaterproofNoNoYesYes
Frame rate15 Hz15 Hz30 Hz25 Hz
screen2.4″ LED2.4-inch LCD204×204 pixel240×204 resolution

Thermal sensor:

The Leupold LTO Tracker HD comes with a super-sensitive 320×240 infrared sensors. This viewer can identify the target from a distance of 150 yards. This makes it easy for you as a hunter because you don’t need to be too close to an animal to take a shot. The thermal sensor comes with the 32-degree field of view, 15-hertz frame rate, 4X zoom, and 750-yard range detection. The temperature sensors most frequently used in thermal instrumentation are thermocouples and platinum resistance thermometers.

There are four commonly used temperature sensor types:

• Negative Temperature Coefficient (NTC) thermistor
• Resistance Temperature Detector (RTD)
• Thermocouple
• Semiconductor-based sensors

Negative Temperature Coefficient (NTC) thermistor:

NTC thermistor is a resistor with a negative temperature coefficient. The NTC sensors are typically used in a range from −55°C to 200°C. It is primarily used as resistive temperature sensors and current-limiting devices. This range is dependent on the base resistance.

Resistance Temperature Detector (RTD):

The RTD is a device that comes with a significant temperature coefficient. It is used as a measurement device. It is passing a low-level current through it and measuring the voltage drop.


A Thermocouple is a sensor that is used to measure temperature. The Thermocouple consists of two wire legs produced from various metals. The wire’s legs are welded together at one end, creating a junction. This junction is where the temperature measured. When the intersection experiences a change in temperature, a voltage is generated.

Semiconductor-based sensors:

The semiconductor-based temperature operates with reverse bias; also, it comes with a small capacitance and a minimum level leakage current. It is compact and produces a linear output with a short range of temperatures. It also a low cost and are accurate subsequent calibration.


The LEUPOLD LTO thermal HD viewer is a second-generation device that can detect heat signatures out to 300 yards. The first impression of the thermal viewer is of a high-quality aluminum flashlight. It is not a rubber eyepiece like on the FLIR scout line that holds the LTO tracker HD out 8-10 inches within your line of sight.

It can produce more of a visible light signature. It comes with an HD 390×390 pixel in a circular display. The LTO-Tracker HD Thermal Viewer displays eight thermal color palettes that allow for optimal thermal viewing in almost any condition. This thermal tracker is small and a high-quality aluminum flashlight, complete with the crenelated bezel.


  • Type: 2.4” TFT Color LCD
  • Resolution: 206×156 QVGA
  • Viewing angle: > 70°
  • Contrast ratio: 500:1

Storage & USB Connection

  • SD card: Removable microSD (up to 32GB)
  • File system: FAT32
  • Images: Portable Network Graphics (PNG) format
  • Approximate number of images: > 2200 (512MB) > 142000 (32GB)
  • USB port: Micro-B
  • Mass storage class: Windows, MAC OS 9 & X, Linux

Thermal Sensor Technology

  • Technology: uncooled vanadium oxide micro-bolometer
  • Resolution: 32,136 total pixels in a 206×156 pixel array
  • Spectral response: 7.5 – 14 microns

Camera Optics

  • Technology: Chalcogenide Glass w/Anti-reflective Coating
  • Focal length: 4 mm
  • Focus range: 152.4 mm – Infinity

Temperature Measurement Type

  • Detection range: -40˚ to 330˚C (-40˚ to 626˚F)
  • Accuracy at 25˚C: Greater of 5˚C or 5% (9˚F or 5%)

Final Thoughts

No doubt the thermal tracker is an invaluable tool for hunters. It is still worth for its durable construction, best of all dependable and multi-purpose functions. It is an affordable handheld viewer that will be satisfying every minute you are using it.

The lightweight and compact design of the Leupold LTO-Tracker HD Thermal Viewer makes it the ideal thermal monocular for your next hunt deep into the backcountry. It makes adventures memorable, and the new HD version is the clear winner from a price and features standpoint.

Kim Goodwin
About Kim Goodwin

Kim Goodwin holds a Master's in thermal engineering from the University of Rhode Island. At Thermo Gears, she reviews most equipment that uses thermal imaging technologies.