Apera GroStar GS4 pH/EC/TDS/Temperature 5in1 Pen-Type Meter (Gen II)

The Apera GroStar GS4 is a 5in1 testing instrument that combines pH, electrical conductivity (EC), 500 ppm and 700 ppm TDS scale options, and temperature in a single pen-type device for greenhouse and agricultural cultivation. Designed for frequent field measurements by growers and cultivation specialists.

The meter delivers reliable readings through a dual-junction pH sensor and titanium conductivity sensor. The 2-point automatic calibration process is rapid, and a sensor health indicator enables electrode condition monitoring. The 3-color backlit LCD display facilitates reading under varying field conditions. TruRead mode allows multi-point measurements with simultaneous display of average, minimum, and maximum values.

The probe is field-replaceable; when the sensor degrades, only the probe needs replacement rather than the entire unit, significantly reducing long-term operational costs. Note that the device lacks IP65 water protection rating and automatic temperature compensation, therefore careful handling is required in humid/wet field environments, and temperature effects must be evaluated manually.

Technical Specifications

Applications

• Nutrient solution monitoring in greenhouse and agricultural cultivation
• Field measurement in water and soil analysis
• EC/TDS and pH control in hydroponic systems