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A pH pen plus the separate ORP probe. GroStar GS1-P Gen II combines its model-specific sensor setup with a practical calibration routine and TruRead session summaries.
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APERA GROSTAR / GS1-P / GEN II / AI201G
One pen body with two measurement setups. The GS1-P configuration combines the GS1 liquid-pH pen and a separate GS5-E platinum ORP probe, so the additional capability is visible in the kit rather than hidden in an accessory list.
Choose GS1-P when you want the pH and ORP probe set supplied together. Swap the probe to change the measurement; it is not simultaneous pH/ORP capture, and it does not add EC/ppm.
2 probes
One pen body
pH setup or ORP setup after a swap
±0.1 pH
pH accuracy
0.1 pH resolution
GS5-E
ORP probe supplied
Not an extra chemical sensor inside GS1-E
Choose by the measurement and the probes supplied. Each card opens that model’s product page; optional compatibility does not mean an extra probe comes in the box.
AI101G
Liquid pH
pH probe supplied; ORP head optional.
AI201G
Liquid pH + ORP kit
Two probes supplied; swap to read ORP.
AI102G
Moist soil/media pH
Spear, dibber and cleaning brush.
AI103G
Liquid EC / ppm
EC sensor supplied; no pH probe.
AI104G
Liquid pH + EC / ppm
Combo head supplied; ORP head optional.
AI204G
Combo + ORP kit
Combo and separate ORP heads supplied.
The P kit supplies both the standard probe and GS5-E. Physically change the installed head to move between the standard setup and ORP. The extra probe is not hidden inside the pH or combo head.
pH and temperature with GS1-E.
Fit the supplied GS5-E and confirm mV mode. ORP is a separate measurement step, not simultaneous capture with the other probe.
GS1 pen with GS1-E pH probe, separate GS5-E ORP probe, pH 4.00 and 7.00 buffers (50 mL each), 3M KCl soaking solution (10 mL), four installed AAA batteries, lanyard and instructions.
The supplied-fluid list is separate from optional compatibility: ORP checking solution and pH 10.01 are separate.
WHAT THIS MODEL IS BUILT TO ANSWER
Use the installed GS1-E for suitable nutrient solutions and aqueous samples. Keep the pH calibration and care routine consistent.
Install GS5-E when an ORP reading is part of the procedure. Redox potential is not a direct chlorine or contaminant concentration.
Choose the P configuration when you need both probes supplied, rather than ordering the base pen and assuming an ORP head is in the box.
Supplied probe: GS1-E / AI801G plus GS5-E / AI805G. The base sensor is double-junction glass for liquid pH.
Replaceability gives the worn sensor a maintenance path; it is not an unlimited service-life guarantee. Install, condition and calibrate the correct head according to its instructions.
A SESSION SUMMARY, NOT A CLOUD LOGGER
In the documented Gen II TruRead workflow, a reading that has stayed stable for seven seconds is recorded for the session. Review the average, maximum and minimum after collecting your measurements. Seven seconds of stability is not the same as a fixed seven-second sampling interval.
6.2 pH
Illustrative minimum
6.3 pH
Illustrative average
6.4 pH
Illustrative maximum
The three illustrative values explain the summary; they do not prescribe a fixed sample count. This pH example does not establish TruRead behavior for the separate ORP setup. The reviewed instructions do not establish retained history, timestamps or export. Use a suitable logger if those are requirements.
Calibrate the pH setup at 7.00 then 4.00, with pH 10.01 separate when appropriate. ORP is checked with a suitable ORP standard using the value at the actual solution temperature, not with pH buffers.
Rinse between standards and samples to limit carryover. Remove excess water and bubbles, then wait for stability.
Use fresh, correct standards. A calibration reminder or electrode-condition display supports the routine; it does not replace checking the method.
Watch the manufacturer’s family tutorial alongside the current Gen II manual. The video is a practical family reference, not proof that every photographed control or accessory is identical across revisions.
The GS1-E pH glass follows GS1’s humid-cap/long-term KCl instructions and must not be stored immersed in pure water. Keep ORP checking and probe care specific to GS5-E; pH slope percentages do not describe platinum ORP-electrode condition.
The ORP probe replaces the pH probe on the same body. Confirm the installed probe and displayed unit before recording.
Use it within an established process and alongside the required analytical checks. An ORP number alone does not prove treatment efficacy or water safety.
The pH condition figure shown after calibration describes electrode response. It is not a battery indicator, soil-health score or guaranteed percentage of service life left. Use the manual’s cleaning, conditioning and calibration checks before deciding whether to replace the probe.
Calibration markers remind you about the routine. Their disappearance after the documented reminder period is not evidence that the pen has automatically erased calibration.
If the job is a cabled-probe water-testing workflow rather than a pocket grower pen, compare the alternatives below. These are separate instruments, not plug-in accessories or direct-soil replacements for GS1-P.
Alternative format: Hanna HI99300 portable liquid EC/TDS meter
Related workflow: Hanna HI98195 portable water pH/ORP/EC meter
GS1-P supplies a separate GS5-E ORP probe alongside the GS1 pH pen and its pH probe. The base GS1 kit does not include that ORP head.
No. Change the installed probe to change the measurement. The pH probe does not become an ORP sensor merely by selecting another screen.
No. The supplied GS1-E and GS5-E cover pH/temperature and ORP workflows. For EC/ppm plus pH with an ORP kit, compare the GS4-P configuration.
The GS1-P configuration supplies GS1-E and GS5-E with pH 4.00 and 7.00 buffers and KCl soaking solution. An ORP checking standard is not listed among those supplied fluids; choose it separately.
pH is 0.0-14.0 with 0.1 resolution and ±0.1 pH accuracy. Apera’s US family catalog lists GS1-P ORP at -1000 to +1000 mV, 1 mV resolution and ±2 mV accuracy. No extra full-scale/digit term is added here.
No. Use a suitable ORP standard for response checking against the bottle’s reference at the actual temperature. The GroStar manual does not establish the ORP60 model’s on-device adjustment menu for GS1-P.
No persistent history, export or timestamp specification is established by the reviewed Gen II instructions. TruRead describes stable readings and session average/max/min; do not assume that extends to every optional-probe mode.
The specified heads are GS1-E, AI801G, and GS5-E, AI805G. Follow the matching electrode’s installation, checking and care instructions rather than treating pH-glass and platinum-ORP procedures as identical.
Review the GS1-P kit and specifications, then return to the price and ordering controls. Blue Tiger Scientific can help you match the measurement, sensor and routine before ordering.
APERA INSTRUMENTS, LLC warrants this instrument to be free from defects in material and workmanship and agree to repair or replace free of charge, at the option of APERA INSTRUMENTS, LLC, any malfunctioned or damaged product attributable to the responsibility of APERA INSTRUMENTS, LLC for a period of TWO YEARS for the instrument and ONE YEAR for the probe from the delivery.
This limited warranty does NOT cover any issues due to:
Use the current Gen II guide for controls, sampling and care. The US catalog adds family/probe/kit comparison; it is not a replacement for the operator instructions. Each card opens a PDF in a new tab.
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