Garden City, Idaho  ·  Est. 2026

The air is doing
something. Read it.

Barometers, anemometers and sky instruments built the way they were when the reading was the only thing that mattered — brass, glass, and a calibration card with your instrument's own numbers on it.

See the collection How we calibrate
Reference
1013.2 hPa
Tendency 3h
−4.1 falling
Bench temp
19.4 °C
Every instrument ships with
its own card
What you are buying

An instrument, and the proof it was checked.

Anyone can print a scale on a dial. We set every instrument against a laboratory reference before it leaves the workshop, write the measured offset on a card, and put that card in the box. You are not buying our word for it — you are buying the figures.

A barometer tells you the pressure. A barograph tells you the shape of the change — which is the part that actually forecasts.

The signature instrument

Seven days of weather,
drawn as one line.

The trace on this drum is a falling limb — the signature of a front arriving. You can read it hours before the sky shows you anything. That is the whole argument for a recording instrument over a dial you glance at.

1012.0hPa now
−7.43-hour tendency
7dper chart
The Hollis Barograph
MONTUE WEDTHU FRISAT SUN 10301020 10101000990
Atmosphere & Pressure — Stratos Instruments Eight instruments

Atmosphere & Pressure

 Wind, Rain & Humidity — Stratos Instruments Seven instruments

Wind, Rain & Humidity

 Sky & Navigation — Stratos Instruments Eight instruments

Sky & Navigation

 Timekeeping & Calibration — Stratos Instruments Seven instruments

Timekeeping & Calibration
What the card in the box records
2 points

Thermometer check

An ice bath at 0 °C and a stirred reference at 40 °C. Both figures written down.

0.1 hPa

Vernier resolution

The Fortin-pattern column resolves a tenth of a hectopascal — three metres of elevation.

96 hours

Deck watch rating

Every movement runs four days in four positions before its mean daily rate is certified.

M2 class

Weight tolerance

The 200 g is within 10 mg of nominal; the 1 g within one.

Civil twilight, 18:42

The last useful half hour of the day.

A thermometer and a hygrometer hanging in the window, read against the light while there is still light to read them by. Everything we make is built for this half hour.

From the workshop

Instruments people actually reach for

The whole collection
Brass Care & Calibration Kit Brass Care & Calibration Kit — in use on a workshop surface
Timekeeping & Calibration

Brass Care & Calibration Kit

$34.99
Walnut Three-Slot Carry Case Walnut Three-Slot Carry Case — in use on a workshop surface
Timekeeping & Calibration

Walnut Three-Slot Carry Case

$64.99
Standard Calibration Weight Set Standard Calibration Weight Set — in use on a workshop surface
Timekeeping & Calibration

Standard Calibration Weight Set

$79.99
Ridgeway Mechanical Interval Timer Ridgeway Mechanical Interval Timer — in use on a workshop surface
Timekeeping & Calibration

Ridgeway Mechanical Interval Timer

$54.99
Lassiter Equatorial Sundial Lassiter Equatorial Sundial — in use on a workshop surface
Timekeeping & Calibration

Lassiter Equatorial Sundial

$109.99
Hadley Marine Deck Watch Hadley Marine Deck Watch — in use on a workshop surface
Timekeeping & Calibration

Hadley Marine Deck Watch

$149.99
Calloway Tide Clock Calloway Tide Clock — in use on a workshop surface
Timekeeping & Calibration

Calloway Tide Clock

$114.99
Mersey Altazimuth Sighting Compass Mersey Altazimuth Sighting Compass — in use on a workshop surface
Sky & Navigation

Mersey Altazimuth Sighting Compass

$89.99
Why brass

It is not nostalgia. It is thermal stability.

Brass moves predictably with temperature, takes a bearing surface without galling, and can be engine-engraved so a scale is cut into the metal rather than printed on top of it. A printed scale wears off. A cut one is still legible when the instrument is older than you are.

How these are made
Civil twilight

The hour these instruments are actually used is the hour the sky turns this colour.

A workshop surface laid out with a barograph chart, a rain gauge tube, a sling psychrometer and a planisphere
The workshop

Nothing here is assembled from a catalogue of parts.

Rotors are balanced as a set and spun before assembly. Thermometer pairs are selected to agree within two tenths of a degree. Every cup wheel, every capsule stack and every movement is checked by the person who put it together, and the figures go on the card rather than into a drawer.

If an instrument cannot be re-zeroed by its owner, we do not sell it. Every dial here has a recessed adjustment screw and a card that explains how to use it without losing the factory setting.

Garden City, Idaho  ·  calibrated against a laboratory reference

The falling limb

A short letter, when there is something worth saying.

New instruments, the occasional note on reading a trace, and nothing else. No more than once a month.

A patinated copper wind vane with cut brass cardinal letters against a dusk sky
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