Tool · Watchmaker's tools & bench

Witschi ChronoProof Pro watch tightness testing device

Partially verified

This catalogued horological workshop tool is a Witschi ChronoProof Pro waterproofness and tightness testing device intended for wristwatches. Catalogued under lot 214, the unit includes an integrated compressor designed to automatically produce vacuum and pressure test cycles when a watch is secured and the testing chamber is shut. The source notes automatic stabilization and measurement timings, an internal printer for printing test result tickets, and a listed measurement resolution of 0.02 μm. An external power adapter is included with the device.

Front view of the closed Witschi ChronoProof Pro testing machine with connected power adapter — Associated Estate & Appraisal. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: www.bidsquare.com
Category: Tool · Watchmaker's tools & bench
Form: Watch tightness testing device
Maker / attribution: Witschi
Reference: ChronoProof Pro
Catalogue / lot identifier: 214
Source-reported date: Not established
Source-reported place: Not established

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Object Identity and Overview

This horological testing unit is catalogued as a Witschi ChronoProof Pro watch tightness testing device for wristwatches, catalogued under lot 214. The listing gives dimensions of approximately 9 by 12 inches (height 9.00 inches, width 12.00 inches) and a weight of 209.7 ounces (catalogued as 209.70 oz).

The catalog notes that the unit includes a power adapter. In the lot photograph, a black power cord and plug are visible behind the right side of the device.

Evidence for this section

“Witschi ChronoProof Pro watch tightness testing device for wristwatches.”
“Measures approximately 9 x 12 inches and weighs 209.7 ounces.”
“Includes power adapter.”

Physical Housing and Visible Characteristics

Visual observation of the photograph shows an enclosed desktop device with a two-part front casing. The lower front section is black and displays the manufacturer logo and model name.

The upper section features a curved silver-tone chamber door with an integrated handle or latch mechanism situated at the top. The seller characterizes condition as good, noting that minor cosmetic wear may be present.

Evidence for this section

“Front panel displays the 'witschi' logo and 'CHRONOPROOF PRO' text on a black lower section.”
“Curved silver-tone upper chamber door with integrated handle/latch mechanism at the top.”
“Minor cosmetic wear may be present.”

Reported Technical Features and Operational Limitations

The auction description states that the unit was the first seal-testing device with a built-in compressor and generates testing vacuum and pressure automatically once a watch is placed inside and the chamber is closed. The catalog listing reports automatic adjustment of stabilization and measurement times, an internal printer for generating physical test result tickets, and a measurement resolution of 0.02 μm.

Because the photograph shows only the closed exterior, the internal chamber, watch-holding fixture, and ticket printer mechanism are not visible in the available image. The auction house explicitly states that functionality was not tested.

Evidence for this section

“It was the first seal-testing device with a built-in compressor, which makes it compact and easy to use.”
“It offers a measurement resolution of 0.02 μm.”
“Functionality not tested.”

Open research questions

What specific electrical input ratings and part numbers are printed on the included power adapter and rear chassis label?
What is the condition of the internal watch-holding mechanism, sensor contact probe, and chamber door sealing gasket?
Does the built-in printer mechanism retain an ink ribbon or thermal paper roll, and is the print head operational?

Source evidence

Recorded claims and source quotations for Witschi ChronoProof Pro watch tightness testing device
Field	Source-reported value	Source quotation
Lot Number	Lot 214	“Lot 214”
Device Function	Watch tightness testing device for wristwatches	“watch tightness testing device for wristwatches”
Included Accessory	Power adapter	“Includes power adapter.”
Integrated Compressor	Built-in compressor for automatic vacuum and pressure testing	“It was the first seal-testing device with a built-in compressor, which makes it compact and easy to use.”
Measurement Resolution	0.02 μm	“It offers a measurement resolution of 0.02 μm.”
Dimensions and Weight	9.00 inches height, 12.00 inches width, 209.70 oz weight	“Measures approximately 9 x 12 inches and weighs 209.7 ounces.”
Printer Feature	Integrated printer producing test result tickets, with option to customize company name or logo	“The device includes a printer to provide a physical ticket with the test results. The ticket can be customized with a company's logo or name.”
Seller-Reported Condition	Good condition; minor cosmetic wear may be present; functionality not tested	“Good condition. Minor cosmetic wear may be present. Functionality not tested.”

Visible details

Front panel displays the 'witschi' logo and 'CHRONOPROOF PRO' text on a black lower section.
Curved silver-tone upper chamber door with integrated handle/latch mechanism at the top.
Black power cord with standard AC plug visible behind the device to the right.