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
VAR-412 Compact 1080p Body Cam with Rotating Lens, Night Vision & Motion Detection
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
TM-214 Window Tint Meter – 0–100% VLT, 4000 Measurements, Portable & Rechargeable
GEM-522 10X Magnifying Loupe – Dual LED & UV Light, Rechargeable Scale Magnifier
88594 GLP-Compliant K-Type Thermocouple Data Logger – High-Accuracy Temperature Monitoring
PHC-402 Dual Relay Digital pH Controller | Auto Dosing with Temp Compensation
SQM-416 Waterproof Soil EC & Temperature Meter | Accurate EC, ATC & IP67
SQM-457 8-in-1 Soil Meter | PH, EC, Moisture, Humidity
STD-439R 3-in-1 Drill Dust Collector & Laser Level Bracket
KC-318 Pinless Moisture Meter | Non-Invasive & Accurate
GEM-462 Dual Magnification Loupe 10× / 25× | Precision Jewelry & Coin Inspection Tool
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
THE-418 Digital K-Type Thermocouple Thermometer | High & Low Temp Probe
BFT-505 Brake Fluid Tester | Digital Brake Fluid Detector for DOT3, DOT4, DOT5.1
EMF-506 Digital Gauss Meter | High-Precision Magnetic Field Detector
RES-28ATC: Precision Salinity Refractometer for Food & Aquatic Applications
GEM-395: High-Quality 20x Magnification Jewelry Loupe with Optical Glass Triplet Lens
PHM-443: High-Accuracy Digital pH & Temperature Meter with Color LCD
CTM-407: Dual-Mode Paint Thickness Meter for Fe/NFe Surfaces
THE-518: Wireless Solar Pool Thermometer with RGB Display & Comfort Alerts
REC-200ATC: Precision Clinical Refractometer for Serum, Urine & RI Testing
PCM‑282 Smart Power & Energy Consumption Monitor
WTM-404 Portable Tint Meter | Measure Visible Light, UV & IR Transmittance in Seconds