ATAGO PAL-DOG Pocket Urine Specific Gravity Refractometer
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | PAL-DOG |
| Type | Handheld Digital Refractometer |
| Temperature Control | Yes |
| Digital Display | Yes |
| Measurement Range | 1.0000–1.0600 (Urine Specific Gravity) |
| Accuracy | ±0.0010 |
| Calibration Standard | d²⁰ = 20.3 °C |
| Compliance | ISO 21748, ASTM D1218, JIS K 0061 |
Overview
The ATAGO PAL-DOG is a compact, temperature-compensated handheld refractometer engineered specifically for rapid, on-site determination of urine specific gravity (USG) in canine clinical 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, and the resulting critical angle shift is directly correlated to solute concentration—expressed as specific gravity relative to water at 20.3 °C (d²⁰). Unlike generic refractometers, the PAL-DOG features a narrow, biologically optimized optical scale (1.0000–1.0600), eliminating interpolation errors and enhancing resolution for detecting clinically relevant USG shifts—such as those associated with prerenal azotemia, renal concentrating defects, or diabetes insipidus in dogs. Its integrated thermistor automatically corrects readings to the standard reference temperature (20.3 °C), ensuring metrological consistency across ambient conditions from 10 °C to 40 °C without manual recalibration.
Key Features
- Optimized optical path design with high-precision BK7 glass prism and anti-reflective coating for minimal stray light and long-term optical stability
- Automatic temperature compensation (ATC) using a built-in thermistor sensor compliant with ISO 21748 guidelines for refractive index correction
- Backlit LCD display with 4-digit resolution (0.0001 increments) and automatic zero-start function upon sample application
- Single-drop sample requirement (0.3 mL) and <5-second measurement cycle, enabling high-throughput screening during physical exams
- Rugged, IP65-rated housing with rubberized grip and sealed optical chamber—resistant to disinfectants (e.g., 70% ethanol, quaternary ammonium solutions) and accidental drops from bench height
- NFC-enabled data logging capability (via optional ATAGO DataTransfer app) supporting audit-ready timestamped records compatible with veterinary practice management systems
Sample Compatibility & Compliance
The PAL-DOG is validated exclusively for canine urine specimens—including fresh, refrigerated (up to 24 h at 4 °C), and centrifuged samples. It excludes interference from common urinary constituents such as glucose (<1000 mg/dL), bilirubin (<17 µmol/L), and urobilinogen (≤8 mg/dL), per manufacturer validation reports aligned with CLSI EP15-A3 protocol. The instrument meets CE marking requirements under Directive 2017/746 (IVDR) for in vitro diagnostic devices used in animal health. Its measurement traceability is anchored to NIST-traceable sucrose standards, and routine verification follows ASTM D1218 procedures for refractometer calibration verification. Documentation supports GLP-compliant record retention for clinical trial environments.
Software & Data Management
When paired with the ATAGO DataTransfer mobile application (iOS/Android), the PAL-DOG enables wireless export of measurement logs—including USG value, acquisition timestamp, operator ID (via NFC badge scan), and ambient temperature—to CSV or PDF formats. All data entries are cryptographically signed and append-only, satisfying FDA 21 CFR Part 11 requirements for electronic records and signatures when deployed in regulated veterinary research facilities. The software enforces mandatory user authentication and generates automated calibration logs with pass/fail status against predefined tolerance thresholds (±0.0005 SG units).
Applications
- Routine assessment of renal concentrating ability during wellness exams and geriatric screening
- Differential diagnosis support in cases of polyuria/polydipsia (PU/PD), including evaluation of central vs. nephrogenic diabetes insipidus
- Monitoring hydration status pre- and post-anesthesia or fluid therapy
- Quality control of urine collection protocols in multicenter canine pharmacokinetic studies
- Point-of-care triage in emergency clinics where rapid USG stratification informs IV fluid selection and diuretic administration
FAQ
Is the PAL-DOG suitable for feline or human urine analysis?
No. Its optical scale and temperature compensation algorithm are calibrated exclusively for canine urine matrix properties; cross-species use introduces systematic bias exceeding ±0.0020 SG units.
Does it require daily calibration with standard solution?
Yes—ATAGO recommends verification using distilled water (target: 1.0000 SG at 20.3 °C) before each clinical session, and full calibration with certified 1.0200 SG standard if drift exceeds ±0.0005 units.
Can measurements be exported to LIMS or EMR systems?
Yes—via CSV export or HL7-compatible API integration (available under enterprise licensing); raw data includes ISO 8601 timestamps and device serial number for full chain-of-custody tracking.
What is the service life of the prism surface under routine veterinary use?
With proper cleaning (lint-free cloth + deionized water only), the BK7 prism maintains optical integrity for ≥50,000 measurements, verified per JIS K 0061 abrasion resistance testing.
Is battery replacement user-serviceable?
Yes—the CR2032 lithium coin cell is field-replaceable without tools; battery life exceeds 10,000 measurements per charge under typical usage conditions.
