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Open-Frame Four-Function Caliper

The open‑frame, four‑function caliper is a versatile, multi‑purpose mechanical measuring tool with an open‑frame design. Constructed from high‑quality stainless steel, it features clear graduations and exceptional wear resistance, enabling measurements of external diameter, internal diameter, step dimensions, and depth—thus meeting the demands of diverse inspection applications.

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Glassware and Measuring Instruments

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lbt@lbt.ltd

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Description

Product Introduction:

Product Applications:

Suitable for a variety of workshop environments. With excellent overall rigidity, stable accuracy, and a comfortable grip, it is a commonly used basic measuring tool in industries such as machining, mold making, hardware, and automotive repair.

The reading principle of a vernier caliper:

The reading mechanism of a vernier caliper consists of two parts: the main scale and the 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.

Reading method for 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 decimal part in millimeters is obtained by multiplying the number of divisions on the vernier scale that align with a particular graduation on the main scale by the instrument’s least count. If no vernier division exactly coincides with a main-scale division, and the reading falls between two values—one greater than and one less than the target value—take 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.

Technical Specifications:

Parameter	Specification Description
Range	Available in 150, 200, and 300 mm.
Graduation value	0.02mm
Precision	±0.03 mm (0–150 mm)
Main material	Stainless steel
Scale craftsmanship	Laser scale
Applicable temperature	0–40℃

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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

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.”

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.”

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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Open-Frame Four-Function Caliper

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