HM Digital 4-in-1 Water Quality Meter COM-300
Professional waterproof tester measuring EC, TDS, Temperature, and pH with automatic calibration and data hold functionality.
Product Specifications
| Type | Water Quality Tester |
| Brand Name | YIERYI |
| Model Number | COM-300 |
| Product Name | 4-in-1 PH Meter |
| Customized Support | OEM |
| Place of Origin | China, Guangdong |
Measurement Ranges
| pH Range | 0.0-14.0 pH |
| EC Range | 0-9990 µS; 0-9.99 mS |
| TDS Range | 0-8560 ppm (mg/L); 0-5000 ppm (mg/L) |
| Temperature Range | 0.1-50℃; 32-122℉ |
Technical Parameters
- Resolution: pH: 0.1 pH | EC: 0-999:1µS/1000-9990:10µS | TDS: 0-999:1ppm/1000-9990:10ppm | Temperature: 0.1℃/℉
- Accuracy: ±0.1 pH; ±2% EC/TDS; ±0.1°C/°F
- ATC: Automatic Temperature Compensation to 25℃ (range: 1-50℃)
- Calibration: pH: Auto calibration at 4, 7, or 10 pH | EC/TDS: Digital calibration via button
- Display: LCD Display Panel
- Housing: IP-67 Waterproof
- Power Supply: 2 AAA Batteries
- Auto Close: After 5 minutes
- Probe: Detachable Electrode
- Product Size: 18.5×3.4×3.4 mm
- Product Weight: 130g
Product Features
- 4-in-1 functionality: EC, TDS, Temperature, and pH measurements
- Waterproof IP-67 housing for durable performance
- Automatic Temperature Compensation (ATC)
- Data hold function for easy reading
- Automatic shut-off after 5 minutes
- Detachable electrode for easy maintenance
- User-selectable conversion factors
Product Images
Packaging & Delivery
Original gift box packaging included.
Frequently Asked Questions
Do you accept custom logos on the product?
Yes, OEM is absolutely supported on both packaging and devices. MOQ is 100 pieces, but smaller quantities are available with adjusted pricing.
What is your quality warranty?
All products include a 1-year quality warranty.
How can I get a sample and what are the terms?
Samples are available with prepaid fees that are refunded when you place a bulk order. Samples ship within 2 working days after payment.
What is the lead time for orders?
Air shipping typically takes 5 working days after payment confirmation.
Do you hold quantities in stock ready to ship?
Yes, we typically maintain 100-200 pieces in stock for immediate shipment.
What about your after-sales services?
We perform 100% quality control before shipment. For quality issues, customers must provide evidence, and we will replace damaged products in the next order.
