Caliper AWTools AW18835 — precision measuring tool for internal, external and depth measurements

AWTools AW18835 caliper is a manual vernier-style measuring instrument for precise internal, external and depth measurements. Compact and robust in concept, the caliper is intended for use in workshops, metalworking, DIY and quality control tasks where reliable linear readings are required. The tool provides tactile adjustment and a vernier scale for direct visual reading of small increments without electronics.

Advantages

The caliper delivers accurate measurements through a vernier scale that requires no batteries, offering consistent performance in environments where electronic devices may be impractical. Its compact size and manual operation make it suitable for use at workbenches or on the shop floor, and the simple construction supports straightforward maintenance and long service life. The AWTools build is optimized for everyday measurement tasks, combining an intuitive measuring principle with durability for repeated use.

Suitable for

• Measuring external diameters of shafts, rods and finished parts
• Checking internal diameters of bores, holes and fittings
• Measuring depth of steps, slots and recesses
• Quality control inspections in workshops and small production
• DIY projects and repair work requiring precise linear measurements

Key specifications

• Measurement functions: external, internal and depth measurements
• Scale type: vernier linear scale for direct reading
• Operation: manual, tactile sliding jaw adjustment
• Form factor: compact caliper suitable for bench and field use
• Application areas: metalworking, workshop, quality control, DIY

How to use

Align the caliper jaws with the object to be measured and slide the movable jaw until it contacts the part without applying excessive force. For internal measurements, use the smaller jaws inserted into the bore and open them until they touch the internal surfaces. For depth measurements, extend the depth probe into the recess and read the vernier scale when the probe base is flush with the reference surface. Read the main scale and then the vernier to determine the final value according to the vernier graduation.

Usage recommendations

Ensure the measuring faces are clean and free of debris before each measurement; avoid applying excessive pressure which can deform both the caliper and the measured part. Store the caliper in a dry place and periodically check the sliding action and scale alignment. Use the tool on stable surfaces for improved repeatability and handle the vernier scale carefully to maintain long-term accuracy.