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Measuring Instruments
  • Anemometers
  • Angle Finders & Inclinometers
  • Battery Testers
  • Cable Testers & Finders
    • Anti-Jamming | Underground Wire Trackers
    • Automotive Short & Open Finders
    • CCTV Cable Wires
    • Kit Sets
    • Live Wire | Transmitter & Receiver Cable Testers
    • Network | LAN | Wire Tone Trackers
    • Optical Power Meters | Optical Light Source
  • Circuit Breaker Finders
  • Data Loggers
    • Air Quality
    • Temperature
    • Humidity
  • Depth Gauges
  • Distance Meters
    • 40 Meters
    • 60 Meters
    • 70 Meters
    • 80 Meters
    • 100 Meters
    • Distance, Wood Stud / Metal / Voltage, Marker (5-in-1)
  • Durometers / Hardness Meters
  • EMF / RF / ELF / Gauss Meters
  • Force Meters
  • Frequency Counters
  • Gloss Meters & Accessories
  • Hygrometers / Humidity Meters
  • Leak Detectors
  • Lux / Light Meters
  • Manometers
  • Moisture Meters
    • Concrete / Mortar / Lime Moisture
    • Grain Moisture
    • Soil pH / Moisture
    • Wood Moisture
  • Multimeters / Scopemeters
  • Radiation / Gamma Meters
  • Solar Meters
  • Sound Level Meters / Calibrators
  • Stroboscopes
  • Surface Roughness Testers
  • Tachometers
  • Tension Testers
  • Thermometers
    • Clinical Thermometers
    • IR Thermometers
    • Kitchen Thermometers
    • Shower Thermometers
    • Thermocouples
  • Thickness Gauges / Coating
  • Tint Meters
  • Ultrasonic Flaw Detectors
  • Ultrasonic Transmitters
  • Vibration Meters
  • Weather Stations
  • Whiteness Meters
Air Quality Meters
  • HCHO (Formaldehyde) Testers
  • CO (Carbon Monoxide) Meters
  • CO2 (Carbon Dioxide) Meters
  • Data Loggers
  • Gas Leak Detectors
  • Thermo-Hygrometer
  • Radiation / Gamma Meters
  • VOC (Volatile Organic Compound) Monitors
  • Accessories

Automotive Testing Equipment
  • Automotive Diagnosis Testers
  • Battery Testers
  • Brake Fluid Testers
  • Car Data Savers
  • Coating Thickness Meters
  • Electronic Stethoscopes
  • Force Meters
  • Gloss Meters & Accessories
  • Hardness Testers
  • Injector Testers
  • Inspection Cameras / Endoscopes / Borescopes
    • 2.3-inch Monitor
    • 2.4-inch Monitor
    • 2.7-inch Monitor
    • 3.5-inch Monitor
    • 4.3-inch Monitor
    • USB-Type
    • WiFi Endoscopes
  • Mechanic's Stethoscopes
  • Multimeters
  • Stroboscopes
  • Tachometers
  • Tint Meters
Construction / Building
  • Angle Finders & Inclinometers
  • Cable Testers & Finders
  • Circuit Breaker Finders
  • Depth Gauges
  • Distance Meters
  • Force Meters
  • Inspection Cameras / Endoscopes / Borescopes
  • Moisture Meters
    • Concrete / Mortar / Lime Moisture
    • Wood Moisture
  • Stud / Joist / Wire Scanners & Level Markers
  • Water Level / Leak Alarms

Dental Loupes
  • 2.5x Titanium / Nickel Alloy Frame
  • 3.5x Titanium / Nickel Alloy Frame
  • 4.0x Nickel Alloy Frame
  • 6.0x Titanium / Nickel Alloy Frame
  • LED Head Lights / Lamps
  • Ultrasonic Cleaners

Fish Finders
  • Underwater Cameras
  • Wired + Wireless Sensor (2-in-1)
  • Wired Sensor
  • Wireless Sensor
  • WiFi Sensors
  • Optional Sensors

Gemological Instruments / Jeweler Tools
  • Desktop LED Lights
  • Diamond & Moissanite Testers
  • Dichroscopes
  • Gem Refractometers
  • Gem Tool Kit Sets
  • Magnification / Jeweler's Loupes
    • 10x Magnification
    • 20x Magnification
    • 25x Magnification
    • 30x Magnification
  • Polariscopes
  • Refractive Index Fluid
  • Ruby / Chelsea Filters
  • Spectroscopes
  • Ultrasonic Cleaners
Health, Fitness & Sports
  • Blood Pressure Monitors
  • Body Fat Calipers
  • Body Surface / Forehead Thermometers
  • GPS Receivers / Finders
  • Heart Rate Monitors
  • Mosquito & Pest Repellers
  • Nebulizers
  • Skin Moisture Meters
  • White Noise Machines

Inspection Cameras / Endoscopes / Borescopes
  • 2.3-inch Monitor
  • 2.4-inch Monitor
  • 2.7-inch Monitor
  • 3.5-inch Monitor
  • 4.3-inch Monitor
  • USB-Type
  • WiFi Endoscopes

Microscopes / Ring Lights / Illuminators
  • Digital Microscopes
  • Fiber Inspection Scopes
  • Fiber Optic Microscope Illuminators
  • Ring Lights
  • Frosted Glass Diffusers

Multimeters / Clamp Meters
  • Analog Multimeters
  • Automotive Multimeters
  • Clamp Meters
  • Digital Multimeters
  • Phase Sequence Testers
  • Scopemeters

Ozone Generators & Air Purifiers
  • Ozone Generators
  • Optional Air Pumps
  • Optional Air Dryers

Refractometers
  • AdBlue / Battery / Anti-freeze / Cleaning Fluid
  • Beer / Wine / Alcohol
  • Brix
  • Clinical
  • Gem Refractometers
  • Honey
  • Salinity
  • Calibration Oil
  • Cover Plates
Water Quality Meters
  • Chlorine Meters
  • Conductivity (EC) Meters
  • Dissolved Oxygen (DO) Meters
  • Electrodes (pH / ORP)
  • ORP Testers / Controllers
  • pH Meters / Monitors
  • pH / ORP Controllers
  • Salinity Meters
  • TDS Testers
  • Thermometers
  • Optional Accessories

Others
  • CCTV Testers
  • Digital Scales

Optional Accessories
  • Air Dryers
  • Air Pumps
  • Calibration Buffer Solutions
  • CD Software & USB Cables
  • Cover Plates
  • Electrodes
  • Extension Cables
  • Fish Finder Sensors
  • Frosted Glass Diffusers
  • Reference Block and Dioptric Oil
  • Temperature Probes
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Gain Express Holdings Ltd.
Office Address

Room 10, 8F, Block B
Merit Industrial Centre
94 To Kwa Wan Rd., To Kwa Wan
Kowloon, Hong Kong

Email Address

info@gainexpress.com

Phone Number (Hong Kong)

(+852) 2362 7800 / 2365 6735

Phone Number (US)

(+1) 347 305 4263

Phone Number (UK)

(+44) 020 3286 9086

WhatsApp

(+852) 5446 6952

Business Hours

Monday to Saturday
10:00 AM - 7:00 PM HKT (GMT+8)

Our Company
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© 2025 Gain Express. All Rights Reserved
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