VIVOSUN pH & TDS Meter Combo - Two Essential Testers in One Pack
Best for: Growers running coco, hydro, or soil with liquid feeds who need to check pH and nutrient strength before every feed.
Our thoughts
Overfeeding and pH lockout are two of the most common ways new growers accidentally hurt their own plants, and both are avoidable with two cheap pen testers used consistently. Bundling a pH meter and a TDS/EC meter together means you're not buying two separate testers from two separate listings. Simple, reliable feeding that delivers results.
The VIVOSUN pH & TDS Meter Combo packs two separate pocket-sized testers: a digital pH pen that reads across the full 0.00-14.00 range with roughly ±0.1 pH accuracy, and a 3-in-1 TDS/EC/temperature meter reading 0-9999 ppm TDS, 0-9999 µS/cm EC, and temperature from 0.1-80°C, with an accuracy of around ±2%. Both include Automatic Temperature Compensation (ATC), so readings stay accurate even as your nutrient solution warms up or cools down through the day.
The pH meter uses one-touch calibration with included buffer powder packs, so getting it accurate out of the box doesn't require separate calibration fluid purchases. Both units have clear LCD displays for fast readouts and are small enough to carry in a pocket between checks, which matters if you're testing runoff or reservoir levels regularly rather than as an occasional check.
How it compares
Pen-style pH and TDS/EC meters are a well-established category, with Bluelab and Hanna Instruments as the most recognised names.
- Bundling both meters together is cheaper than buying a Bluelab pH Pen and a separate Bluelab Truncheon or Hanna EC meter as two purchases
- Bluelab's pH Pen typically offers tighter accuracy and a more durable waterproof housing, reflected in a higher price
- Comparable core functionality (ATC, one-touch calibration) to Hanna's entry-level combo testers, at a lower price point
You're trading a bit of long-term durability and precision for a genuinely low-cost way to get both readings covered from day one.
Usage guidance
Consistent testing habits matter more than the meter itself for avoiding feeding problems.
Calibrating the pH meter
Calibrate before first use and periodically thereafter using the included buffer powder packs - a pH meter drifts over time, so recalibrating every few weeks keeps readings trustworthy.
Testing your feed
Check pH and TDS/EC of your nutrient solution before every feed, adjusting pH into the 5.5-6.5 range typically suited to coco and hydro, or slightly higher for soil.
Checking runoff
Test runoff water after feeding to spot early signs of nutrient lockout or salt build-up before it shows up as visible leaf damage.
Storage
Keep the pH probe tip moist (in storage solution or slightly damp) between uses rather than letting it dry out, which shortens probe life and affects accuracy.
Technical specifications
- pH range: 0.00-14.00
- pH accuracy: approx. ±0.1 pH
- TDS range: 0-9999 ppm
- EC range: 0-9999 µS/cm
- Temperature range: 0.1-80°C / 32-176°F
- TDS/EC accuracy: approx. ±2%
- Calibration: one-touch, buffer powder packs included
- Compensation: Automatic Temperature Compensation (ATC)
- Format: 2 separate pocket-sized pen testers
Who this is for
- New growers who don't yet own any pH or TDS testing equipment
- Coco and hydro growers who need to check feed solution before every watering
- Anyone troubleshooting suspected lockout or feeding issues via runoff testing
- Growers wanting a low-cost combo rather than two separate premium meters
Best suited to growers who test regularly and want dependable basic readings rather than lab-grade precision.
Our take
This solves the two most common causes of avoidable growing mistakes - wrong pH and wrong feed strength - for less than the price of a single premium meter elsewhere. It won't match a Bluelab for long-term durability, but for regular use and clear readings it does the job.
Worth picking up if you want straightforward feeding without the hassle of guessing.
