Gain Express
Gain Express is a Hong Kong-based manufacturing and trading company established in 2003 that offers a wide range of electronic products and testing instruments. We have years of trading experience (B2B / B2C) with customers from North America, South America, Asia, Australia / Oceania, Europe, Africa, the Middle East and so on.
Some of our products have passed European CE certification and ISO9001 quality management system certification. Get high quality but affordable tools from us!
WQM-339 7in1 Pentype Tester PH / TDS / EC / ORP / Salinity / S.G. / Temperature Meter Water Tester
VAR-378 Magnetic Mini Voice-Activated Recorder | 64GB, 30-Hour Battery & MP3 Playback
SLM-336 Smart Decibel Meter | Real-Time Noise, Temperature & Humidity Monitoring
PHC-342 Smart pH & ORP Controller with Remote App Alerts & Wi-Fi Monitoring
LUX-426 Split-Probe Digital Lux Meter with Temp Sensor & Bluetooth App
AQM-434 4-in-1 Gas Leak Detector | Instant Alerts for EX, CO, H₂S & O₂
SQM-416 Waterproof Soil EC & Temperature Meter | Accurate EC, ATC & IP67
WQM-448 3-in-1 Waterproof pH | EC | Temp Tester | Portable Water, Food & Soil Quality Meter
LUX-485 Bluetooth Light Lux Meter | Wireless Illuminance Sensor with Data Logging
PHC-493 Smart pH / EC / Temp Meter | Online Water Quality Controller
CTM-407: Dual-Mode Paint Thickness Meter for Fe/NFe Surfaces
THE-518: Wireless Solar Pool Thermometer with RGB Display & Comfort Alerts