How to Zero a Thermal Scope (Step by Step)
Zeroing a thermal scope follows the same logic as zeroing any rifle scope. Fire, see where it lands, move the reticle to match. There's one twist: you need a target that actually shows up in thermal, and most modern thermals have a one-shot "freeze" feature that makes the job quick. Here's how to do it properly.
The short answer
Set up a target that holds heat, so the bullet's point of impact shows in thermal. Fire a shot (or a small group) from a steady rest at a known distance. Use your scope's freeze or one-shot zero function: freeze the image, then move the floating reticle from your aim point onto the bullet hole. Confirm with another shot. Always follow your own model's menu. The steps below are the universal method.
Before you start
- A steady rest. Bags, a bipod or a clamping rest take out the wobble that hides small aiming errors.
- A known distance. 50m or 100m are common. Pick the distance you'll actually hunt at and write it down.
- A target you can see in thermal. This is the bit that's different from zeroing a day scope. More below.
- Your scope charged and focused. Set the dioptre so the reticle is crisp, and focus the image before you shoot.
Making a target you can see in thermal
A thermal scope sees heat, not ink, so a plain paper target is nearly invisible and a bullet hole in it shows no temperature contrast. Make some contrast instead:
- Stick a hand-warmer, a square of foil, or heat-reflective tape on a plain backer as your aim point. It glows clearly in thermal.
- Use a target backed by something that shows the bullet hole's temperature difference, or check the hole through a spotting scope between shots.
- Zero around dusk or at night, when the target and backer are a different temperature to their surroundings. High noon on a hot day washes the contrast out.
The zeroing steps
- Aim and fire one carefully placed shot (or a 3-shot group if you want to be sure) at your aim point from the rest.
- Go into the zeroing menu and use the freeze function. It locks the current image so you can work without holding the rifle perfectly still.
- Keep the reticle on your original aim point, then move the floating or secondary reticle marker onto the actual bullet hole using the windage and elevation controls.
- Save. The scope shifts the point of aim to match the point of impact.
- Confirm with another shot. It should now land on your aim point. Fine-tune if you need to.
With the freeze or one-shot method you can often zero with a couple of rounds instead of chasing groups across the target. The brands call it different things. HIKMICRO, Pulsar and Nocpix each have their own version, so check the exact menu path in your model's manual.
After you've zeroed
- Write down the distance you zeroed at and check it now and then, especially after remounting or a hard knock.
- If your scope has multiple zero profiles, save one per rifle or load so you can switch without re-zeroing.
- Remember detection isn't identification. Zero at a realistic distance and keep your shots inside the range where you can clearly identify the animal. More on that in our detection range guide.
FAQ
How do I see a paper target through a thermal scope?
Generally you can't. Thermal sees heat, not print. Use a heat source like a hand-warmer or foil as your aim point and a backer that shows the bullet hole's temperature difference, and zero when there's a temperature contrast between the target and its surroundings.
What is one-shot or freeze zeroing?
A feature that freezes the sighted image after a shot so you can move the reticle onto the bullet hole without holding the rifle steady. It lets you zero in as little as one or two rounds.
What distance should I zero at?
The distance you'll actually shoot at. 50m or 100m are common starting points. If your scope has a ballistic calculator, a known zero distance is also what it works from.
Do I need to re-zero if I take the scope off?
With quality mounts and return-to-zero rings, often only a confirmation shot. Save a zero profile where your scope supports it, and always confirm after remounting.
Related: Thermal Rangefinders and Ballistic Calculators, Detection Range and Lens Size, Thermal Scopes, How Thermal Imaging Works and Best Thermal Scopes 2026.
Related: choosing ring height for a thermal and how to mount a HIKMICRO Stellar without losing zero.