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Left-hand dial indicator open-type four‑function caliper

The left‑handed vernier caliper is designed for users who favor their left hand or for situations where measurement can only be taken from the left side. The open‑type, four‑function vernier caliper is a versatile, general‑purpose mechanical measuring tool with an open‑frame design. Crafted from high‑quality stainless steel, it features clear graduations and exceptional wear resistance, enabling measurements of external diameter, internal diameter, step dimensions, and depth—meeting the needs of a wide range of applications.

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Glassware and Measuring Instruments

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lbt@lbt.ltd

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Left-hand dial indicator open-type four‑function caliper

Description

Product Introduction:

The left‑handed vernier caliper is designed for users who work with their left hand or for situations where measurement can only be taken from the left side. The open‑type, four‑function vernier caliper is a versatile, general‑purpose mechanical measuring tool with an open‑frame design. Crafted from high‑quality stainless steel, it features clear graduations and exceptional wear resistance, enabling measurements of external diameter, internal diameter, step dimensions, and depth—meeting the needs of a wide range of applications.

Product Applications:

Suitable for a variety of workshop environments. With excellent overall rigidity, stable accuracy, and comfortable handling, 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 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 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 scale divisions on the vernier scale that align with a corresponding 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 alignment falls between two values—one greater than and one less than—the reading should be taken as the average of the two adjacent 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.

Technical Specifications:

Parameter	Specification Description
Range	150
Graduation value	0.02mm
Accuracy	±0.03mm
Main material	Stainless steel
Scale craftsmanship	Laser scale
Applicable temperature	0–40℃

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Left-hand dial indicator open-type four‑function caliper

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