The Apera GroStar GS1-P (AI201G) is a Generation II, lab-grade handheld meter designed for measuring pH, oxidation-reduction potential (ORP), and temperature in commercial cultivation environments. The kit includes two interchangeable probes: a replaceable double-junction pH probe with a low-impedance lithium glass membrane and blue gel inner electrolyte, and a replaceable platinum ORP probe. The meter automatically switches measurement modes when the probes are exchanged, eliminating the need to navigate menus. Its IP67-rated waterproof and dustproof body is suitable for humid grow rooms, fertigation stations, and reservoir areas. The instrument supports nutrient-solution acidity monitoring and ORP checks for evaluating disinfection processes involving oxidizing sanitizers such as chlorine, hydrogen peroxide, and ozone.
• Product Type: pH/ORP/temperature pen tester kit
• Brand: Apera Instruments
• Model: GroStar GS1-P (Generation II)
• SKU: AI201G
• Measurement Parameters: pH, ORP, and temperature
• pH Probe: Replaceable double-junction electrode with low-impedance lithium glass membrane and blue gel inner electrolyte
• ORP Probe: Replaceable double-junction platinum electrode
• Measurement Mode Switching: Automatic when changing between the pH and ORP probes
• Calibration: Automatic two-point pH calibration with electrode-condition display
• Display: Three-color backlit LCD — white for measurement, green for calibration, and red for errors
• TruRead Mode: Records readings and displays average, minimum, and maximum values across multiple samples
• Waterproof Rating: IP67 — waterproof and dustproof for routine use in humid cultivation environments
• Power Supply: AAA batteries
• Power-Saving Feature: Automatic shutoff
• Primary Applications: Nutrient-solution pH monitoring, reservoir checks, and disinfection-process monitoring
• ORP Monitoring Applications: Evaluating oxidizing sanitizer solutions involving chlorine, hydrogen peroxide, ozone, and similar treatments
• Suitable Growing Systems: Hydroponic and aeroponic systems, including recirculating systems
• Probe Maintenance: Replaceable probes; calibration is recommended every two weeks during active use
• Included Calibration Solutions: pH 7.00 and pH 4.00 buffer solutions, 50 mL each
• Included Storage Solution: 3M KCl, 10 mL
• Other Included Accessories: GS1-P meter, pH probe, platinum ORP probe, lanyard, and user manual
• Warranty: 2 years for the instrument and 1 year for the probes
• Important Limitation: Does not measure EC or TDS; those parameters require a separate meter or a compatible multi-parameter model.
Key Advantage: The Apera GroStar GS1-P combines pH measurement and ORP monitoring in one portable instrument, with separate replaceable probes for each measurement. This makes it useful for cultivation facilities that need to check nutrient acidity and evaluate oxidizing-sanitizer processes without carrying two separate meters. Its automatic mode switching, TruRead functionality, and included calibration solutions simplify routine quality-control checks across reservoirs and fertigation stations.