YANRUN BJ-X Portable Measuring Microscope

Overview

The YANRUN BJ-X Portable Measuring Microscope is an upright, manually operated optical instrument engineered for rapid, on-site dimensional inspection and qualitative metallurgical observation in industrial environments where benchtop microscopy is impractical. Designed around classical finite-conjugate optics with a standardized 160 mm mechanical tube length, the BJ-X employs interchangeable achromatic objectives and a calibrated widefield 10× reticle eyepiece to deliver direct analog measurement capability without digital image capture or software dependency. Its core principle relies on geometric magnification combined with linear scale interpolation—enabling real-time, operator-driven assessment of feature size, grain boundary spacing, coating thickness, and surface defect geometry on metallic, ceramic, or polymer specimens. The compact monolithic frame, low center of gravity, and integrated battery-powered LED illumination ensure stable operation in field conditions—including production floors, maintenance bays, and quality control checkpoints—without external power or vibration isolation tables.

Key Features

• Upright optical configuration optimized for reflective, opaque samples—ideal for metallurgical, failure analysis, and QC applications requiring surface topography evaluation.
• Interchangeable objective turret-free design: single objective (2×, 4×, 5×, or 10×) pre-mounted for simplified setup and reduced contamination risk in dusty or oily environments.
• Calibrated 10× widefield reticle eyepiece with 0.1 mm per division precision—enabling direct manual measurement via ocular scale superimposition on the specimen plane.
• 30 mm coarse focusing travel with dual-knob adjustment—providing robust depth-of-field accommodation across varied sample heights and roughness profiles.
• Self-contained illumination system: integrated pen-type LED powered by two standard AA batteries—delivering consistent cold-white light (≈6000 K CCT) with no heat-induced specimen drift or thermal distortion.
• Lightweight aluminum-magnesium alloy chassis (0.65 kg) and compact footprint (143 × 63 × 210 mm)—facilitating one-handed transport, tripod mounting, or use inside confined spaces such as engine blocks or piping manifolds.

Sample Compatibility & Compliance

The BJ-X accommodates flat, polished, or as-ground metallic specimens up to 30 mm in height and unlimited lateral dimension (subject to working distance constraints). Its 7–18 mm working distance range supports both high-resolution surface detail inspection (10× objective, 7 mm WD) and macro-level overview imaging (2× objective, 18 mm WD) without repositioning. While not certified to ISO/IEC 17025 or ASTM E883 for forensic metrology, the instrument’s optical calibration traceability aligns with general-purpose industrial inspection requirements under ISO 9022-3 (optical instruments — environmental testing) and conforms to basic GLP documentation practices when used with controlled calibration logs. No CE, UKCA, or FDA registration applies, as the device falls outside regulatory scope for diagnostic or clinical instrumentation.

Software & Data Management

The BJ-X operates entirely offline with no embedded firmware, USB interface, or digital connectivity. Measurement data are recorded manually in laboratory notebooks or QC check sheets using the reticle scale. Users may supplement documentation with external smartphone-captured images (via eyepiece projection), though such images lack pixel-scale calibration and are not suitable for ISO 15530-3 compliant dimensional reporting. For traceable metrology workflows, laboratories commonly pair the BJ-X with independently validated stage micrometers and annual verification against NIST-traceable line standards. Audit trails require handwritten entries per GLP Annex 13 principles, including operator ID, date, objective used, and observed values.

Applications

• Routine metallographic verification: grain size estimation (ASTM E112), inclusion rating (ASTM E45), and phase distribution assessment on polished cross-sections.
• In-process dimensional checks: weld bead width, machined edge radius, burr height, and thread root profile on finished components.
• Field-based failure analysis: crack propagation mapping, corrosion pit depth estimation, and coating delamination boundary tracing.
• Educational demonstration: hands-on optics training in technical schools, emphasizing parallax-free focusing, depth-of-field trade-offs, and reticle-based measurement uncertainty.
• Toolroom metrology backup: rapid verification of gage block wear, cutting tool flank angles, or EDM electrode erosion—where portability outweighs sub-micron resolution needs.

FAQ

Does the BJ-X support digital image capture or USB output?
No. It is an analog-only instrument with no camera port, video output, or digital interface.
Can I use multiple objectives simultaneously?
No. The BJ-X accepts only one fixed objective at a time; switching requires manual unscrewing and replacement.
Is the reticle eyepiece factory-calibrated and certifiable?
The 0.1 mm/division scale is factory-set and verifiable with a stage micrometer; however, no certificate of calibration is supplied by default.
What is the expected battery life under continuous use?
Approximately 12–15 hours with two fresh AA alkaline cells, assuming moderate ambient temperature and LED brightness setting.
Is the instrument compatible with third-party measuring stages or adapters?
Mechanical mounting uses standard M3 threads at the base; custom dovetail or tripod adapters can be fabricated, but YANRUN does not supply or endorse accessories.