---
product_id: 514754304
title: "AI104G GroStar Series GS4 pH/EC/500ppm/700ppm Combo 5-in-1 Pen Tester Kit with Replaceable Double-Junction pH/EC Probe for Hydroponics Water Quality Testing, Gen II"
brand: "apera instruments"
price: "1090.25 DT"
currency: TND
in_stock: true
category: "Apera Instruments"
url: https://www.desertcart.tn/products/514754304-ai104g-grostar-series-gs4-ph-ec-500ppm-700ppm-combo-5
store_origin: TN
region: Tunisia
---

# HD backlit screen with quick calibration 5-in-1 multi-parameter testing Replaceable double-junction probe AI104G GroStar Series GS4 pH/EC/500ppm/700ppm Combo 5-in-1 Pen Tester Kit with Replaceable Double-Junction pH/EC Probe for Hydroponics Water Quality Testing, Gen II

**Brand:** apera instruments
**Price:** 1090.25 DT
**Availability:** ✅ In Stock

## Summary

> 🌱 Grow smarter, not harder — the ultimate hydroponic testing pen for pros!

## Quick Answers

- **What is this?** AI104G GroStar Series GS4 pH/EC/500ppm/700ppm Combo 5-in-1 Pen Tester Kit with Replaceable Double-Junction pH/EC Probe for Hydroponics Water Quality Testing, Gen II by apera instruments
- **How much does it cost?** 1090.25 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/514754304-ai104g-grostar-series-gs4-ph-ec-500ppm-700ppm-combo-5)

## Best For

- apera instruments enthusiasts

## Why This Product

- Trusted apera instruments brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-in-One Confidence:** Streamline your hydroponic water quality testing with one trusted tool.
- • **Grower-Centric Design:** Intuitive 2-point calibration done in under a minute on a bright, easy-to-read screen.
- • **Maintenance Made Simple:** Electrode condition indicator and calibration reminders keep your readings reliable.
- • **Precision Meets Efficiency:** Lab-grade accuracy for pH, EC, TDS, and temperature in one sleek device.
- • **Sustainable & Cost-Effective:** Replace only the probe, not the whole pen—smart engineering that saves you money.

## Overview

The Apera Instruments AI104G GroStar GS4 is a professional-grade 5-in-1 pen tester designed for hydroponic growers, measuring pH, EC, TDS (500ppm & 700ppm), and temperature with high accuracy. Featuring a replaceable double-junction pH/EC probe, an HD backlit screen, and a fast, grower-friendly calibration process, it ensures reliable water quality monitoring with minimal maintenance. Trusted by experts for durability and precision, it’s the essential tool for optimizing crop success.

## Description

Apera Instruments GroStar GS4 pH/EC/ppm Combo Pen Tester (Gen II) is a lab-grade multiparameter meter designed specifically for growers to easily manage crop success, featuring a replaceable pH/conductivity combo sensor and a grower-friendly workflow along with other intelligent functions and features that help reduce the guesswork and give you the confidence in every measurement.

## Features

- Lab-grade pH/EC/TDS meter designed specifically to meet growers' needs and habits
- Measures pH, EC, 700ppm, 500ppm, 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 pH/EC probe with double junction pH sensor and titanium EC sensor
- Electrode condition indicator and calibration reminder function help you perform proper maintenance in a breeze

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BGQFPGMY |
| Batteries | 4 AAA batteries required. (included) |
| Best Sellers Rank | #40,556 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #43 in Lab pH Meters |
| Date First Available | September 28, 2022 |
| Item Weight | 4.7 ounces |
| Item model number | AI104G |
| Manufacturer | Apera Instruments |
| Product Dimensions | 7 x 1.5 x 1.3 inches |

## Images

![AI104G GroStar Series GS4 pH/EC/500ppm/700ppm Combo 5-in-1 Pen Tester Kit with Replaceable Double-Junction pH/EC Probe for Hydroponics Water Quality Testing, Gen II - Image 1](https://m.media-amazon.com/images/I/61QciN9a4YL.jpg)

## Available Options

This product comes in different **Pattern, Style** options.

## Frequently Bought Together

- Apera Instruments AI104G GroStar Series GS4 pH/EC/500ppm/700ppm Combo 5-in-1 Pen Tester Kit with Replaceable Double-Junction pH/EC Probe for Hydroponics Water Quality Testing, Gen II
- Apera Instruments pH Probe Electrode Sensor Care Maintenance Kit, Including pH 4/7/10 buffers, 3M KCL Soaking Solution, Probe Cleaning Solution, a CalPod Solution Organizer (AI1170)
- Apera Instruments 3M KCL Storage Soaking Solution (8 oz.) for pH and ORP Electrodes

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**Shop now:** [https://www.desertcart.tn/products/514754304-ai104g-grostar-series-gs4-ph-ec-500ppm-700ppm-combo-5](https://www.desertcart.tn/products/514754304-ai104g-grostar-series-gs4-ph-ec-500ppm-700ppm-combo-5)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-09-19*