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Pointer-type vernier caliper with open‑type single‑direction claw jaws (long‑reach extended claws)

The open‑type, single‑jaw caliper features an open‑frame design and a unidirectional jaw, specifically engineered for measuring the outer diameter, thickness, and other dimensions of large, elongated workpieces.

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Glassware and Measuring Instruments

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lbt@lbt.ltd

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Pointer-type vernier caliper with open‑type single‑direction claw jaws (long‑reach extended claws)

Description

Product Introduction:

The open‑type, single‑jaw caliper features an open‑frame design and a unidirectional jaw, specifically engineered to measure the outer diameter, thickness, and other dimensions of large, elongated workpieces. Its body is crafted from stainless steel, offering excellent rigidity, wear resistance, clear graduations, smooth sliding action, and stable measurements.

The open‑frame design facilitates cleaning and maintenance, making it well suited to harsh workshop environments. The single‑direction long jaws can reach deep into workpieces or measure at remote locations, addressing measurement scenarios that conventional calipers cannot access. Equipped with a locking mechanism, it allows readings to be secured for convenient re‑inspection and record‑keeping.

Product Applications:

It is widely used for large‑size, long‑distance, and deep‑dimensional measurements in industries such as machining, mold making, hardware, pipe manufacturing, and sheet metal fabrication.

Technical Specifications:

Parameter	Specification Description
Range	0–500 mm, 0–600 mm, 0–1000 mm
Graduation value	0.02mm
Accuracy	±0.05 mm (for a range of 0–500 mm)
Main material	Stainless steel
Scale craftsmanship	Laser scale
Applicable temperature	0–40℃

The reading principle of a vernier caliper:

The reading mechanism of a vernier caliper consists of a main scale and a vernier scale. When the movable jaws are brought into contact with the fixed jaws, the “0” mark on the vernier scale aligns with the “0” mark on the main scale, at which point the distance between the jaws is zero. As the slide is moved to the left to a certain position, the distance between the fixed and movable jaws corresponds to the measured dimension of the part. The integer portion of the dimension can be read from the main‑scale markings to the right of the vernier’s zero line, while the fractional part—less than 1 mm—can be determined by reading the vernier scale.

How to read a vernier caliper:

The reading of a vernier caliper consists of the integer part in millimeters and the decimal fraction in millimeters. The method for taking the reading is as follows:

(1) Integer part: Starting from the first graduation line on the main scale to the left of the vernier zero mark, read the integer portion in millimeters.

(2) Decimal part: The decimal portion in millimeters is obtained by multiplying the number of scale divisions on the vernier scale that align with a particular division on the main scale by the instrument’s least count. If no vernier scale division exactly coincides with a main‑scale division, and the reading falls between two values—one larger and one smaller—take the average of the corresponding least‑count increments.

(3) Determine the measured value by addition: Add the integer part of the millimeter measurement to its decimal part; the result is the measured dimension of the workpiece.

Measurement range mm	Division value mm	Indication/week mm	Accuracy mm	L mm	a mm	d mm	e mm	f mm
0-500	0.02	2	±0.05	650	90	21	10	18
10-500	0.02	2	±0.05	650	90	21	5	18
10-600	0.02	2	±0.05	750	90	21	5	18
0-600	0.02	2	±0.05	750	90	21	10	18
0-1000	0.02	2	±0.07	1190	150	28	10	24

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Does your pipe pressure burst testing machine control test temperature automatically? What’s its main application?

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Customer Reviews

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From Thomas Bennett, Quality Director, UK plastic pipe factory

2026.06.05

★★★★★

“We have purchased two sets of pipe testing equipment from Laibote (Tianjin) for 18 months. The ring stiffness and hydrostatic burst testing machines run stably for daily batch inspection, test data matches ISO standard requirements precisely, and the intelligent test software is easy for our operators to master. Their after-sales team offers timely remote technical guidance whenever we have operational problems, spare parts supply is efficient. We have arranged a second bulk order for our new production workshop and will recommend Laibote’s testing machines to our industry partners across Europe.”

Middle East Construction Lab｜Purchase: Universal Electronic Testing Machine & Geotextile Test Equipment

From Mohamed Kareem, Lab Manager, UAE third-party construction inspection institute

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★★★★★

“We compared multiple testing equipment brands from Europe and China before cooperating with Laibote. Their WDW universal tester and full-set geotextile testing instruments meet local construction testing standards perfectly. Custom fixtures tailored per our specimen specifications save much testing time. Pre-sale technical communication was patient and professional; engineers provided online operation training after goods arrived. Stable machine performance greatly improves our laboratory’s detection efficiency, we are satisfied with cost performance and overall service.”

Southeast Asia Rubber & Polymer Factory｜Purchase: Vicat Softening Point & Tensile Testing Machine

From Tanaka Hiroshi, R&D Supervisor, Indonesia rubber materials enterprise

2026.06.05

★★★★★

“Laibote’s Vicat softening point tester and electronic tensile machine have been applied to our raw material incoming inspection and new formula development for over one year. High testing accuracy effectively controls our product defect rate. What impresses us most is their responsive after-sale service; technical staff reply our troubleshooting requests within 24 hours even for time zone differences. Compared with expensive European brands, Laibote’s equipment balances quality and price excellently, we plan to expand procurement of auxiliary testing instruments next quarter.”

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Pointer-type vernier caliper with open‑type single‑direction claw jaws (long‑reach extended claws)

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