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Apera Instruments GroStar Series GS4-P pH/EC/500ppm/700ppm/ORP 6-in-1 Combo Pen Tester Kit with Replaceable Double-Junction pH/EC Probe and ORP Probe for Hydroponics Water Quality Testing, Gen II
✅ In stock
F
Grade
Analysis Confidence
100%
Price verified Sep 24, 2026 1:40 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- 💰The current price sits right around what this item typically fetches.
- 📉It has been quite a while since a more competitive price was available, lending today's offer solid comparative value.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
3.97/22
Market Standing
5.38/20
Deal Strength
0/20
Momentum
4/10
📝 Product Overview
🏪 Sold by
Apera Instruments
🚚 Shipping
Free Shipping
Product Details
✓Lab-grade instrument designed specifically to meet growers' needs and habits
✓Measures pH, EC, 700ppm, 500ppm, ORP, and temperature with premium probe technologies, ensuring high accuracy and durability with minimal maintenance
✓Grower-friendly calibration workflow on an HD backlit screen allows you to finish 2-point calibration within a minute
✓Replaceable combo probe with double junction pH sensor and titanium EC sensor, ORP probe included for ORP (redox) test
✓Electrode condition indicator and calibration reminder function help you perform proper maintenance in a breeze
⚙️ Specifications
Range
0 to 14.0 pH; 0 to 10.0 EC, 0 to 7000ppm (700ppm), 0 to 5000ppm (500ppm); -1000 to 1000 mV; 0 to 50˚C (32 to 122˚F)
Resolution
0.1 pH; 0.1 EC; 10 ppm; 1 mV; 0.1˚C/0.1˚F
Accuracy
±0.1 pH; ±0.1 EC; ±30 ppm (500ppm); ±40ppm (700ppm); ±2mV; ±1˚C/±1˚F
Temperature Compensation
Automatic 0 to 50˚C
Calibration
pH: Automatic 1 to 3 points (4/7/10); EC/ppm: Automatic 1 point (2.77EC)
Unit
pH, EC, ppm, mV, ˚C, ˚F
Product Dimensions
7 x 1.5 x 1.3 inches
Item Weight
1.74 pounds
Manufacturer
Apera Instruments
ASIN
B0BVTGC2KW
Date First Available
February 15, 2023
