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A question comes up on the night vision forums every month: someone has found a used tube or a monocular from a small seller and wants to know whether the asking price is fair. Working out a fair night vision tube price is more tractable than the usual it-depends answer suggests. If you isolate each feature against a real price ladder, every increment carries its own number, and any offer can be measured against them. This article gives you that ladder and the arithmetic.
If you are not yet clear on what the figure of merit actually measures, read our explainer on what FOM means in night vision first; this article assumes you know and focuses purely on what it costs.
The ladder: one housing, many tubes
The cleanest way to price a tube is to hold everything else constant. A PVS-14 pattern monocular with an identical housing, identical lenses and identical accessories is available across roughly eleven tube configurations. Every price difference between them is the tube.
Reading those configurations in pairs isolates each feature:
- Green to white phosphor, same tube grade. A modest step, and the smallest premium on the ladder. Phosphor is a preference, not a performance tier.
- Non-gated to autogated at the same figure of merit. A larger step, and the best value increment on the whole ladder.
- Figure of merit 1400 to 1600, both autogated. A moderate step for 200 points.
- Figure of merit 1600 to 2000, both autogated Gen 2+. A much larger step for 400 points. The price per point more than doubles at the top of the Gen 2+ range.
- Gen 2+ at 2000 to Gen 3 at 2000, both white and autogated. A modest step for the generation label at equal measured performance.
- Two-pin to three-pin manual gain, same tube. The smallest step of all, and worth taking if you want control of the picture.
What this tells you about any offer
Take the classic forum case: a Gen 2+ tube described as figure of merit 1500, offered at two thousand dollars.
If that price is for a complete autogated monocular with a data sheet, it sits at the top of its fair band. Defensible, not a bargain.
If it is for a bare tube, it is well above market. Our own bare NVT5-class tubes with measured values between roughly 1600 and 1850 sit meaningfully below that, and NVT7-class tubes measuring between 1880 and 2110 are only modestly above it. Paying a 2000-class price for a 1500-class tube is the single most common overpayment in this market.
If it is for a non-gated tube at any price near that, walk away. Gating is the feature that separates a tube you can use near roads and buildings from one you cannot.
NVT5-class tube, measured FOM 1827.36, autogated, white phosphor · NVT7-class tube, measured FOM 2110.72
The number that matters more than the bracket
Notice that our bare tube listings do not say 1600 plus. They say 1711.56, 1763.24, 1827.36, each against a serial number.
Figure of merit is resolution multiplied by signal-to-noise ratio, so two tubes both sold as 1600 plus can measure 1601 and 1848. That gap is worth real money on the ladder above and is visible on a genuinely dark night. Before you pay for any tube, get the sheet, read the actual resolution and signal-to-noise ratio, and price it against the measured number rather than the bracket. A seller who cannot produce a sheet is selling you a bracket, and bracket-minimum is the correct price for it.
The performance requirements these measurements descend from are public documents. The Defense Logistics Agency publishes them, and MIL-PRF-49427 is the specification covering this class of assembly if you want to read what the parameters mean rather than take a marketing sheet's word for it. Measurement traceability generally, including the optical quantities behind these numbers, is the domain of national metrology institutes such as NIST's Physical Measurement Laboratory.
Night vision tube price by seller type
Where you buy changes the fair price as much as what you buy, and it is worth being explicit about why.
A manufacturer or established dealer prices tubes with data sheets, tested and warrantable. You pay a premium for the documentation and the recourse, and for most buyers that premium is the cheapest insurance available.
A specialist reseller sits in the middle. Documentation varies. Ask specifically whether the sheet was produced by the seller or came with the tube, because a sheet the seller generated on their own bench is worth more than a photocopy of unknown origin.
A private sale is where the ladder matters most, because there is no recourse at all. Price accordingly: a private-sale tube should be meaningfully below dealer price for the same measured numbers, and far below it without a sheet.
What you are actually paying for at each step
It helps to know what the money buys physically rather than just what the label says.
Gating is a circuit that switches the photocathode rapidly, protecting the image when bright light enters the field. It is added hardware, which is why it carries a real premium and why it is worth paying.
Figure of merit is not a component. It is the outcome of how well that particular tube came out of manufacture, measured after the fact. You cannot add it later, and that is why the price per point climbs steeply at the top of the range: high-measuring tubes are the tail of a distribution, not a product line.
Phosphor type is a manufacturing choice made before the tube exists, which is why it costs relatively little. White is generally preferred for extended use, but it is a preference rather than a performance tier.
The gain interface is contacts and a control path. Small cost, meaningful convenience.
Pricing a used tube
Used tubes need two adjustments to the ladder.
First, discount for unknown hours. Tubes age, and a tube with no history should be priced as an unknown rather than as its badge implies.
Second, discount heavily for no data sheet. Not slightly: heavily. Without resolution, signal-to-noise and blemish grade you cannot value it, cannot match it to a partner, and cannot tell whether it is at the start or the end of its life.
Blemish grade deserves particular attention on used tubes, because a spot in the centre of the field is a different proposition from the same spot at the edge, and photographs rarely show it honestly. Ask where the blemishes are by zone.
What a fair offer looks like written out
Putting it together, a reasonable listing for a bare tube states the serial number, the measured resolution in line pairs per millimetre, the measured signal-to-noise ratio, the resulting figure of merit, the phosphor, whether the tube is gated, the gain interface, and the blemish grade by zone. It also states whether the tube is new or used and, if used, what it came out of.
That is nine facts. A listing carrying all nine is offering a specification you can price. A listing carrying three is offering a category.
If you are negotiating, the productive question is never can you do better on price. It is what is the measured figure of merit and can I see the sheet. Sellers with good tubes answer immediately, and the answer often makes the price look reasonable rather than high.
When the cheap end is the right end
None of this means expensive is correct. For observation over open ground under a reasonable moon, an entry-level non-gated tube at figure of merit 1400 is a perfectly good tool, and the money you did not spend buys a mount and a spare lens set that you genuinely need.
The step to autogating pays for itself the first time a vehicle turns its headlights toward you. The step past figure of merit 1600 pays for itself only under canopy, on genuinely dark nights, or when you are matching a second tube for a binocular and want headroom.
Buying a complete unit rather than a bare tube also removes a whole class of risk, because it arrives tested, purged and collimated. The monocular night vision range is the easiest place to compare complete configurations against whatever bare tube you are being offered.
Complete PVS-14 with NVT5-class FOM 1600 autogated tube
Two situations where the ladder does not apply
Matched pairs are priced above two singles of the same grade, and that premium is legitimate rather than opportunistic. Matching costs bench time and it costs inventory, because the seller has to hold enough tubes to find two that agree. If you are building a binocular, budget for a pair rather than assuming two singles will do.
Tubes attached to a complete, tested unit also break the ladder in your favour. The unit arrives collimated, purged and measured, and that work has real cost. Comparing a bare tube price against a complete unit price without accounting for it makes the complete unit look worse than it is.
A three-question test before you pay
What is the measured figure of merit and the serial number? Is the tube autogated? Is the price for a complete unit, a housing with lenses, or a bare tube? Three clear answers make an offer comparable. A missing first answer means you are buying a bracket.
Frequently Asked Questions
How do I know if a night vision tube price is fair?
Isolate the features. Gating, phosphor, figure of merit band and gain interface each carry their own premium, and holding the housing constant lets you see them. Then compare the offer against a complete unit at the same tube grade, because that is the alternative you actually have.
Is a tube advertised as FOM 1600 plus worth the same as one measuring 1848?
No. Figure of merit is resolution multiplied by signal-to-noise ratio, and two tubes in the same advertised bracket can differ by more than two hundred points. That difference is worth real money and is visible on a dark night. Always price against the measured number on the data sheet.
Should I pay extra for a Gen 3 tube?
Only if the measured numbers justify it. Generation describes manufacturing technology, not delivered performance. A Gen 2+ tube measuring 2000 outperforms a Gen 3 tube measuring 1800 on the numbers that describe what you will see, and the two often sit close in price.
How much should I discount a used tube with no data sheet?
Heavily. Without resolution, signal-to-noise ratio and blemish grade you cannot value the tube, match it to a partner, or judge how much life it has left. Treat it as a lottery ticket and pay accordingly.
Is autogating worth the premium?
For most users, yes, and it is the best value increment on the ladder. Autogating is what prevents bright artificial light from washing out the image, which matters anywhere near roads, buildings or vehicles. A non-gated tube is only sensible if you are certain you will always be far from artificial light.
