Quick answer: a COTI is a clip on thermal imager that lays heat over the night vision you already look through; our Night Operators Jerry-C Pro is a 640 x 512 clip on at $2,949. A thermal monocular is a separate device you look through on its own; our PREDATOR starts at $749.95. Own analog night vision and want heat without switching devices: clip on. Want to scan by hand, or own no night vision: monocular. See the Jerry-C Pro, from $2,949.
Once you own night vision, the next question is almost always thermal. And the first fork in that road is simple to state and easy to get wrong: do you put the thermal in front of your night vision, or do you carry it as its own device? This guide compares the two side by side, with real prices, real specs and an honest answer for each kind of user.
What is the difference between a COTI and a thermal monocular?
A thermal monocular is a complete thermal camera with its own screen and its own eyepiece. You raise it to your eye, or mount it on a helmet, and look at a heat picture of the world. Nothing else is needed. Our PREDATOR thermal monocular, from $749.95, is one: a 256 x 192 thermal sensor with a 25 mK NETD at a true 60 Hz, shown on a 1.54 inch AMOLED.
A COTI, or clip on thermal imager, has no eyepiece. It clamps onto the objective lens of a 1x analog night vision tube and projects its heat picture into that tube. You keep looking through your night vision, and anything warm is marked on top of the tube picture. The Jerry-C Pro does this with a 640 x 512 sensor at 1x, and no calibration step.
| Jerry-C Pro COTI clip on thermal | PREDATOR thermal monocular | |
|---|---|---|
| Price | $2,949 | From $749.95 |
| Used with | A 1x analog night vision tube (PVS-14, PVS-31) | Nothing: complete on its own |
| Thermal sensor | 640 x 512, 12 micron | 256 x 192, 25 mK NETD, 60 Hz |
| How you see heat | Laid over your night vision picture | On its own screen, a heat picture only |
| Magnification | 1x only | 4 mm wide lens fitted; 13 mm distance lens accepted |
| Range figure | Recognition 275 m on a 1.7 x 0.5 m target (manufacturer test figure) | Person at 100 m (4 mm), 250 m (13 mm), measured on our units |
One caution on the range row: the two figures were measured in different ways, so they do not compare one for one. The Jerry-C Pro figure is the maker's lab test; the PREDATOR figures were measured on our own production units. Our guide on detection, recognition and identification explains what each kind of range means.
How does each one work in the field?
The real difference shows up at night, in how you move between finding and seeing.
With a thermal monocular, most owners work in two steps. They scan with the thermal to find anything warm, then switch to night vision, or to their own eyes, to see what it is and where they are walking. That two device habit works well, and plenty of people use it on purpose: the thermal finds, the tube confirms. Our guide to running thermal and night vision together covers it step by step.
With a clip on thermal, both steps happen at once in the same eyepiece. The tube shows you the ground, the trail and the tree line; the clip on marks the warm animal standing in it. You never take your eye off the night vision to check the heat. For anyone moving on foot under a goggle, that is the big draw: no raising a second device, no losing your place in the scene.
The short version: a monocular is for looking at heat. A clip on is for seeing heat inside the night vision picture you are already walking with.
Which one sees farther?
It depends on what you mean by farther. A handheld with a distance lens can bring a far target closer, because it can magnify. The PREDATOR accepts a 13 mm distance lens for exactly that. A clip on cannot magnify: the Jerry-C Pro is 1x by design, because it has to line up with a 1x night vision tube. So for picking out detail on something far away, a monocular with a longer lens has the edge.
A clip on has a different edge: resolution at 1x. The Jerry-C Pro sensor is 640 x 512, which spreads many more pixels over its 35 x 30 degree view than a 256 x 192 sensor does over a similar view. Warm shapes at walking distance come out with cleaner edges. If pixel counts are new to you, 12 micron vs 17 micron thermal explains sensor size and pitch, and thermal refresh rate explains why a 60 Hz screen feels smoother when you pan.
Can a thermal monocular go on a helmet too?
Yes, and that blurs the line a little. The PREDATOR is helmet mountable, so you can wear it in front of one eye and keep the other eye, or a night vision monocular, for the scene. That is a two device setup on one helmet: a heat picture in one eye, a tube picture in the other, side by side rather than laid on top of each other. Some owners like it; others find two different pictures, one in each eye, harder to read than one blended view. A clip on gives the blended view: one picture, heat drawn inside it. If you are weighing those two helmet setups, our guide on handheld vs helmet mounted thermal goes through the trade offs.
Which costs less?
On its own, the thermal monocular, by a wide margin: the PREDATOR starts at $749.95 against $2,949 for the Jerry-C Pro. Our HEAT thermal monocular is lower still; we reviewed what it does in the HEAT thermal monocular review. The clip on costs more because of what it has to do: put a high resolution heat picture into your tube, at the same size as the tube picture, with no calibration, in a 90 g package.
The comparison changes if you count what you already own. If you have an analog goggle, the clip on is the only thing you buy, and you get heat inside the night vision. If you own no night vision at all, a clip on needs a goggle under it, so the fair comparison is a monocular against a goggle plus a clip on. Our COTI price guide lays out every kit.
Who should buy a COTI, and who should buy a thermal monocular?
| You are | Our pick | Why |
|---|---|---|
| An analog night vision owner who moves on foot at night | Jerry-C Pro | Heat inside the view you already walk with |
| A watcher who scans fields from one spot | PREDATOR | Scan by hand, swap to the distance lens for far targets |
| New to night gear, no night vision yet | PREDATOR first | A clip on needs a goggle; a monocular works alone |
| An owner who wants both, over time | Monocular now, clip on later | Many owners end up running both |
There is no rule that says you must pick one. Plenty of owners carry a handheld for wide scanning and run a clip on for moving through the scene. If you are still weighing whether thermal is worth adding at all, read is a thermal worth it if you already own night vision.
What about a fusion goggle?
There is a third choice for people starting from scratch: a goggle with the thermal built in. Our ELF-FB20 fusion binocular puts a 640 x 512 thermal between the two pods of a dual tube goggle, from $8,299.95. It is the most complete answer and the most costly one. We compare it with the clip on route in COTI vs fusion goggles, and every clip on mode is shown in COTI modes explained.
What do they have in common?
Both are thermal, so both share thermal's limits: neither sees through glass or walls, both read surface heat, and both lose contrast on hot summer evenings when the ground is as warm as the animal on it. Our guides on what thermal cannot do and thermal in summer heat apply to either choice. And both run on lithium cells; for the Jerry-C Pro that means CR123A 3V only, never a 16340 rechargeable, which runs at 3.7V.
Frequently asked questions
What is a COTI?
A COTI is a clip on thermal imager. Unlike a thermal monocular it has no eyepiece: it clamps onto the objective lens of an analog night vision tube and projects heat into it, so warm targets show inside your night vision view. Our Jerry-C Pro is a 640 x 512 thermal at 1x for $2,949.
How much is a COTI?
Our Jerry-C Pro is $2,949. The US dealer listings we compared for the same 640 x 512 class ran $3,577 to $4,475 (read 22 October 2026). A thermal monocular costs less on its own: our PREDATOR starts at $749.95, but it does not lay heat over your night vision.
What is the most affordable COTI?
The lowest priced complete 640 x 512 clip on thermal we found was our Jerry-C Pro at $2,949, against US dealer listings of $3,577 to $4,475 read on 22 October 2026. If you want to spend less than that, a thermal monocular such as the PREDATOR is the way to start.
What is the best COTI for the money?
For an analog night vision owner, the best value is a 640 x 512 clip on at 1x that needs no calibration and ships with the clamp ring, remote and battery pack. The Jerry-C Pro does that at $2,949. Warranty is 3 months, up to 12 months with Operator Care.
What is the best COTI for the price?
At $2,949 the Jerry-C Pro gives you a 640 x 512, 12 micron sensor laid over your tube picture, Highlight, Outline and Breathing modes, a compass heading and a wireless remote. The 640 x 512 US dealer listings we read on 22 October 2026 started at $3,577.
Can I use a COTI as a handheld thermal?
No. The Jerry-C Pro has no eyepiece of its own and is made to feed a night vision tube. For a thermal you can raise and look through by itself, choose a thermal monocular such as our PREDATOR, which starts at $749.95 and also mounts on a helmet.
One clamp ring, one heat picture laid over the night vision you already own. The Night Operators Jerry-C Pro is a 640 x 512 clip on thermal imager at 1x for the PVS-14 and the PVS-31, with a wireless remote, a battery pack and the clamp ring set in the box. Jerry-C Pro, from $2,949.