Item Type: TesterModel: FH-77Material: ABSRange ppb 0~1999ppbppm 0~1.99ppmResolution ppb 1ppbppm 0.01ppmAccuracy ppb ±10ppbppm ±0.02ppmAutomatic Temperature Compensation 0℃~50℃Working Temperature 0℃~50℃Package List：1 x Tester1 x Manual Two-Scale Accuracy Measurement: Detects dissolved from 0-1999ppb (±10ppb) and 0-1.99ppm (±0.02ppm) with 1ppb/0.01ppm resolution; Calibrated ranges cover water machines, and laboratory H2 experiments, ensuring compliance with industrial-grade accuracy standards Auto-Temperature Calibration: Integrated 0℃~50℃ compensation adjusts readings for ambient variations; Pre-set calibration points eliminate manual recalibration during field tests in hydroponic farms, maintaining ±0.02ppm reliability across applications Low-Power Alert System: Design with voltage monitoring warns of energy depletion; Simplified compartment access allows quick replacements during extended field surveys or aquaculture facility inspections, minimizing downtime in key measurement workflows Lightweight ABS Construction: Ergonomic pen-style housing weighs under 100g for single-handed operate; Clear error prompts prevent misuse during infusion system maintenance or beverage industry H2 concentration audits, reducing training costs for non-professional operators Cross-Scenario Compatibility: Operates within 0℃~50℃ ambient for hot spring analysis, and aquarium dissolved oxygen correlation studies; Pre-calibrated sensors require no technical expertise, ideal for home users and academic researchers Item Weight 9.3 ounces Manufacturer Baxnore Item model number Baxnore02pao6vkdq Package Dimensions 9.06 x 2.76 x 2.36 inches