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Open‑type single‑jaw caliper with extended jaws (large‑range, extended‑jaw version)

Name: Open‑type single‑jaw caliper with extended jaws (large‑range, extended‑jaw version)
Brand: Laibote (Tianjin) Testing Machinery
Availability: InStock

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.

Category:

Glassware and Measuring Instruments

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E-mail:

lbt@lbt.ltd

WhatsApp:

+86-15102211717

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Open‑type single‑jaw caliper with extended jaws (large‑range, extended‑jaw version)

Description

Product Introduction:

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 challenges that conventional calipers cannot handle. Equipped with a locking mechanism, it allows readings to be secured for convenient re‑inspection and documentation.

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	300–3000 mm optional
Graduation value	0.02mm
Precision	±0.05 mm (when the measuring range is 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 specific 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 graduations 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 part 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 portion: The number of divisions on the vernier scale that align with a particular division on the main scale, multiplied by the instrument’s least count, gives the decimal part in millimeters. If no vernier division exactly coincides with a main‑scale division—instead falling between two values—one may read the average of the corresponding least‑count increments.

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

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FAQs

Do you supply full-set testing instruments for asphalt and geotechnical engineering projects?

We offer complete lab solutions including asphalt viscosity tester, asphalt rutting tester, geotextile permeability tester, low-temperature flexibility tester and concrete/cement test equipment, covering raw material detection for road, water conservancy and construction engineering projects

Can you customize fixtures or test machines based on our special test requirements? How about after-sales service and warranty?

We provide non-standard customization of test equipment and customized fixture clamps according to customers’ specimen size and test standards. All our testing machines enjoy 12-month factory warranty; overseas customers get remote online debugging guidance, spare parts supply and technical operation training. Our products have been exported to over 70 countries globally

Which materials can be measured by your Vicat softening point tester?

It measures heat deflection temperature and Vicat softening temperature of plastics, hard rubber, nylon, insulating materials and fiber-reinforced thermosetting composites. Intelligent temperature control guarantees precise heating rate, ideal for plastic raw material incoming inspection and formula development in plastic factories.

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

Yes, the constant-temperature circulating system keeps stable test environment during long-time hydrostatic resistance and instant burst pressure measurement of thermoplastic pipes. It complies with GB6111 standard and serves raw material inspection, new product R&D for plastic pipe manufacturers, third-party testing labs and university laboratories.

What kinds of pipes fit your ring stiffness tester? Can it do long-term creep testing?

This equipment is designed for HDPE, PVC corrugated pipes, plastic drainage pipes and various plastic tubular products. Apart from ring stiffness, ring flexibility and flattening tests, it supports continuous long-term creep tests up to 1000 hours (42 days) as required by industry specifications, widely used for pipe factories and construction quality inspection institutes.

What test items can your WDW series computer-controlled electronic universal testing machine complete? Which international standards can it meet?

Our WDW universal tester is applicable for tension, compression, bending, shearing and peeling tests of metal, plastic, rubber and composite materials. It supports test procedures in accordance with GB, ISO, ASTM, DIN, JIS multiple domestic and global standards. Equipped with high-precision servo drive and dedicated test software, it automatically collects, calculates and exports test data including tensile strength, elongation at break and elastic modulus.

Customer Reviews

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.”

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

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

2026.06.05

★★★★★

“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.”

European Plastic Pipe Manufacturer｜Purchase: Ring Stiffness & Hydrostatic Burst Tester

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.”

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