Caliper Keltin 0–150 mm plastic measuring instrument (model 40/240)

Plastic caliper Keltin 0–150 mm (model 40/240) is a handheld measuring instrument designed for internal, external and depth measurements within a 0–150 mm range. Made from lightweight plastic, this caliper provides corrosion-resistant and portable measurement capability for workshops, hobby projects, classrooms and basic inspection tasks. It is intended for quick checks and simple dimensional control where high-precision metal calipers are not required.

Advantages

The caliper combines low weight and ease of use with a non-corroding plastic construction that resists moisture and light chemical exposure. Its simple sliding jaw design enables fast, repeatable readings for routine measurements. Because it is inexpensive and resistant to surface damage, it is practical for educational environments, portable toolkits and situations where a robust but non-precision instrument is preferred.

Suitable for

• Basic external measurements of parts and objects up to 150 mm
• Internal diameter checks of openings and bores within the measurement range
• Depth measurements for shallow features using the depth rod
• Workshop and hobby tasks where approximate or comparative dimensions are sufficient
• Classroom demonstrations and student practice in measurement techniques

Key specifications

• Measuring range: 0–150 mm
• Construction material: plastic (lightweight, corrosion-resistant)
• Measurement types: external, internal, depth
• Scale type: manual vernier/linear scale for direct reading
• Overall length suitable for handheld use and portable storage

How to use

To measure external dimensions, position the object between the external jaws and slide the movable jaw until contact is made; read the value from the scale. For internal measurements, expand the internal jaws inside the opening and take the reading from the scale. For depth measurements, extend the depth rod into the feature and read the scale when the base sits flat on the reference surface. Ensure the caliper jaws are clean and free of debris before use and avoid applying excessive force that could deform the plastic components.

Usage recommendations

Store the caliper in a dry place away from direct sunlight and high heat to preserve the plastic material. For more reliable dimensional checks, compare readings with a known reference gauge or a metal caliper when higher accuracy is required. Clean gently with a soft cloth and mild detergent if needed; do not use abrasive cleaners or solvents.