BALL Watch Trainmaster Kelvin

In addition to basic timekeeping and date indications, the BALL Watch Trainmaster Kelvin offers thermometer function powered by a patented mechanical movement.

Watch with mechanical thermometer

William Thomson, 1st Baron Kelvin, an Irish and British physicist and engineer born on 26th June, 1824 in Belfast, was a pioneer in developing the absolute thermodynamic temperature scale.

In 1848 he proposed in his paper, On an Absolute Thermometric Scale, the need for a scale whereby “infinite cold” (absolute zero) was the scale’s null point, and which used the degree Celsius for its unit increment.

Lord Kelvin further calculated that absolute zero (the temperature at which all thermal motion ceases) was approximately equivalent to −273 °C.

This absolute scale is known today as the Kelvin scale, and the kelvin (K) has since become a unit of measurement for temperature. Scientists nowadays have achieved temperatures extremely close to absolute zero, where matter exhibits quantum effects such as superconductivity and super-fluidity.

Like Lord Kelvin in the scientific field, Webb C. Ball can also lay claim to the same pioneering role in the history of watchmaking, as he introduced the first chronometry standards used by the American railroad companies.

The system developed by Webb C. Ball at the end of the 19th century was based on such stringent precision criteria that it was used by the Swiss Society of Chronometry (COSC) as the basis for its own certification system in 1973.

These same values of precision and reliability shared by the measurement of time and temperature have inspired BALL Watch to create watches equipped with the patented mechanical thermometer unit.

BALL Watch Trainmaster Kelvin

This timepiece is included in the “Trainmaster” series with its models that naturally hark back to the first watches bearing the “BALL’s Standard” marking and which ensured the safety of trains thanks to their unparalleled precision.

BALL Watch Trainmaster Kelvin Grey Dial with Celsius Scale
BALL Watch Trainmaster Kelvin Grey Dial with Celsius Scale

The Trainmaster Kelvin has naturally been equipped with the BALL RR1601-C caliber including the TMT mechanical thermometer module.

This function, developed and patented by BALL Watch, measures the outside temperature between -31°F and 113°F (-35°C and 45°C ) with an accuracy of 97% that only a mechanical thermometer can achieve. The thermometer readings are given in increments of 18°F (5°C) in the half-moon shaped window at 6 o’clock on the dial.

BALL Watch Trainmaster Kelvin White Dial with Celsius Scale
BALL Watch Trainmaster Kelvin White Dial with Celsius Scale

BALL Watch produces its TMT module using bi-metallic materials of the highest quality. Bands are carefully wound, heat treated, cut according to very precise specifications, their ends folded and then laser welded. The plate and bridge are then custom-manufactured. BALL watchmakers place, decorate and then assemble the jewels and pins.

The same procedure also applies to the patented screw adjustment system. This essential component ensures extremely high temperature measurement precision by stabilizing the position of the bi-metallic coil while still allowing it to expand or contract in response to the changing temperature.

BALL Watch Trainmaster Kelvin Grey Dial with Fahrenheit Scale
BALL Watch Trainmaster Kelvin Grey Dial with Fahrenheit Scale

Its case with a diameter of 39.5mm and a thickness of 11.8mm is made of stainless steel. The dial and hands are equipped with the luminescent technology developed by BALL Watch. Microtubes of H₃ gas, requiring no external source of light or energy and 100 times more effective than conventional luminescent paint, ensure perfect legibility in the dark.

The sapphire crystal caseback bears the temperature conversion between the Kelvin and Celsius scales. The movement, visible through the caseback adds a meticulous touch of elegance to the watch.

BALL Watch Trainmaster Kelvin White Dial with Fahrenheit Scale
BALL Watch Trainmaster Kelvin White Dial with Fahrenheit Scale

The Trainmaster Kelvin is available with a grey or silver dial, featuring Celsius or Fahrenheit scale. The watch is mounted on a crocodile leather strap with pin buckle.

Technical details

Model: BALL Watch Trainmaster Kelvin Automatic Series

Model Numbers
NT3888D-LLCJ-GYC: Grey Dial with Celsius Scale
NT3888D-LLCJ-GYF: Grey Dial with Fahrenheit Scale
NT3888D-LLCJ-SLC: White Dial with Celsius Scale
NT3888D-LLCJ-SLF: White Dial with Fahrenheit Scale

Automatic caliber BALL RR1601-C
Chronometer certified COSC

Patented mechanical thermometric indication (range: from -35°C to 45°C/-31°F to 113°F)
Hours, minutes, sweep seconds and date

Stainless steel
Ø 39.5mm, height 11.8mm
Anti-reflective sapphire crystal
Sapphire crystal case back
Shock resistant to 5,000Gs
Anti-magnetic to 4,800A/m
Water resistant to 30m/100ft

Grey or silver with Celsius or Fahrenheit scale
14 micro gas tubes on hour, minute, second hands and dial for night reading capability

Crocodile leather strap with standard buckle

Discover More BALL Watch Models

History of BALL Watch Company

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