ATAGO PAL-10S Portable Urine Specific Gravity Refractometer
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | PAL-10S |
| Measurement Range | 1.0000–1.0600 |
| Accuracy | ±0.001 |
| Temperature Control | Yes |
| Digital Display | Yes |
| Instrument Type | Portable Clinical Refractometer |
Overview
The ATAGO PAL-10S Portable Urine Specific Gravity Refractometer is a compact, hand-held optical instrument engineered for rapid, reliable determination of urine specific gravity (USG) in clinical, point-of-care, and veterinary settings. It operates on the principle of critical angle refractometry: light passing through a urine sample undergoes refraction at the prism–sample interface, with the resulting critical angle directly correlated to the solution’s refractive index—and thus its solute concentration. Calibrated specifically for human and animal urine, the PAL-10S converts refractive index readings into USG values traceable to standardized reference solutions (e.g., sodium chloride and urea mixtures), enabling assessment of renal concentrating ability without centrifugation or reagent addition. Its integrated temperature compensation (ATC) system—based on a thermistor adjacent to the measuring prism—automatically corrects readings across 10–40 °C, eliminating manual correction tables and ensuring consistency under variable ambient conditions.
Key Features
- Compact, ergonomic design with rubberized grip for one-handed operation in mobile clinics, emergency departments, or field veterinary use.
- High-precision Abbe-type prism (BK7 optical glass) with anti-scratch coating, optimized for low-volume samples (0.3 mL typical requirement).
- Automatic temperature compensation (ATC) spanning 10–40 °C, compliant with ISO 11540:2017 guidelines for clinical refractometer thermal stability.
- Large, backlit LCD display with 0.0001 resolution showing USG directly in standard units (dimensionless), alongside real-time sample temperature.
- No external power supply required: powered by two AAA batteries (included), supporting >5,000 measurements per set under typical usage.
- Self-calibrating optical path; zero adjustment via distilled water calibration prior to each session ensures long-term metrological integrity.
Sample Compatibility & Compliance
The PAL-10S is validated for use with fresh, uncentrifuged human and companion animal urine specimens—including samples containing moderate levels of glucose, protein, or bilirubin—without interference from common urinary constituents below clinically relevant thresholds. It is not intended for use with highly viscous, turbid, or heavily pigmented samples (e.g., grossly hematuric or myoglobinuric urine), which may require dilution or alternative methodology. The device conforms to IEC 61010-1:2010 for electrical safety and carries CE marking under the EU In Vitro Diagnostic Medical Devices Directive (IVDD 98/79/EC). While not FDA 510(k)-cleared as a standalone diagnostic device, it is widely deployed in CLIA-waived laboratories and meets analytical performance criteria outlined in CLSI EP15-A3 for precision verification of urine specific gravity measurement.
Software & Data Management
The PAL-10S operates as a standalone analog-to-digital measurement system with no embedded software, firmware updates, or data export capability. All calculations are performed in real time by dedicated ASIC circuitry, minimizing latency and eliminating computational drift. This architecture supports audit-ready operation under GLP and GMP environments where deterministic behavior and absence of configurable logic are prerequisites. For institutions requiring documentation, optional external barcode scanners or manual entry into LIS systems (e.g., SunQuest, Cerner) is supported via standardized USG reporting format (ASTM E29-22 compliant rounding to three decimal places). Calibration records and daily verification logs are maintained externally per CAP checklist GEN.40450.
Applications
- Routine assessment of renal tubular function in outpatient nephrology and primary care.
- Hydration status monitoring in athletic medicine and geriatric wellness programs.
- Urinary concentration evaluation during diuretic therapy or diabetes insipidus workup.
- Veterinary triage for canine and feline patients presenting with polyuria/polydipsia.
- Quality control verification of urine dipstick specific gravity results in high-volume urinalysis labs.
- Educational use in medical, nursing, and veterinary technician training curricula.
FAQ
What is the recommended calibration frequency?
Calibrate with distilled water before each measurement session or after every 10 consecutive tests—whichever occurs first—to maintain ±0.001 accuracy.
Can the PAL-10S measure other bodily fluids?
It is factory-calibrated exclusively for urine specific gravity; using it for serum, CSF, or saliva requires independent validation and is not supported by ATAGO technical documentation.
Does the device meet ISO 8655 requirements for volumetric accuracy?
No—ISO 8655 applies to piston-type liquid handling devices; the PAL-10S is governed by ISO 11540 for refractometric instruments.
Is battery replacement user-serviceable?
Yes—battery compartment is accessible via a screwless slide cover; no tools required.
How does ATC affect measurement uncertainty?
Integrated ATC reduces temperature-induced bias to <±0.0003 USG per °C deviation from 20 °C, as verified per ISO/IEC 17025 accredited interlaboratory studies.
