Gain Express Holdings Ltd.

Gain Express Holdings Ltd., established in March of 2003 and based in Hong Kong, is a professional supplier of excellent products worldwide and whose objective is the satisfaction of each consumer by understanding what you want servicing what you need. We provide and deliver a wide range of products like ph meters (for soil and water) and controllers, ORP testers and controller, jewelry tools, microscopes and camera halogen and LED illuminators, Microscope Prepared Slides, Gemology stones, etc., from aquatic to laboratory to industrial to business to educational and even for personal or home use. We've partnered with Hong Kong Post, EMS, Fedex, UPS, DHL to ship and deliver all the products carefully as fast as we can to every continent, and right to your doorstep.

Approved by strict quality and safety standards to ensure that all our products are of the highest quality, our products goes thru strict screening and testing, making sure that each product functions properly before it ships to the consumer. With the CE approval marked on the products, ensures that it passes the European standards. Our factory is certified by EN ISO9001-2000 to assure that all our products and services are in accordance with international standards.

Our primary obligation to serve our consumers and clients is to provide and deliver fast with the most reliable, precise and accurate products with honesty, and with correct, helpful and informative content and photos. Rest assured that our products are of excellent quality with superb end-user support.YOUR SATISFACTION IS OUR GOAL.

We offer the following product lines:

Meter / Tester
> PH Meter
> Conductometer
> ORP Meter
> PH Controller
> PH/ORP Controller
> Digital Conductivity Controller
> Level Controller
> Thermometer
> Anemometer
> Digital Moisture Meters
> Lux / Light Meters
> Digital Sound Level Meter
> Digital Thickness Meter/Gauge
> Digital Hardness Durometer
> EC/PH/PPM stick
> Tachometer
> Stroboscope
> Vibration Tester

Microscope / Camera illuminator
> LED Ring Light
> Fiber Optics Illuminator

Traditional Design Refractometer
> BRIX
> OECHSLE (Oe°)
> ALCOHOL
> CLINICAL
> HONEY
> SALINITY
> INDUSTRIAL FLUID
> OIL TESTING
> BRAKE FLUID
> ANTIFREEZE BATTERY CLEANING FLUID

New Design Refractometer (with built-in calibration screw)
> BRIX
> OECHSLE (Oe°)
> ALCOHOL
> CLINICAL
> HONEY
> SALINITY
> INDUSTRIAL FLUID
> OIL TESTING
> BRAKE FLUID
> ANTIFREEZE BATTERY CLEANING FLUID

With Builtin LED Design Refractometer
> BRIX
> OECHSLE (Oe°)
> ALCOHOL
> CLINICAL
> HONEY
> SALINITY
> INDUSTRIAL FLUID
> OIL TESTING
> BRAKE FLUID
> ANTIFREEZE BATTERY CLEANING FLUID

> Gem Refractometer

Gem Identifications Tools
40x Measuring Microscope + Helicoid focusing + LED Penlight
Chelsea Filter for Gem, Emerald, Identification tools
Desktop LED light for Polariscope / Darkfield Loupe
Desktop Polariscope Built-in LED
DIAMOND TESTER / SELECTOR + MOISSANITE Tester with UV Lights
Gem Refractometer (Black) w/ Built-in LED illumination + RI Oil
Gem Refractometer (Silver) w/ Built-in LED illumination + RI Oil
Gemological Refractometer + Index oil Flashlight Polarizing Lens
Handheld Darkfield Loupe, 10x, with Flashlight
Handheld Polariscope with Flashlight
Heavy Duty New Calcite Dichroscope
High Res USB2 Microscope w/ 1.3MP Video Camera+LED Switch+Modes
Jeweler's Loupe - Chrome Plated 2-in-1 - 10x & 20x Magnification
Loupe, 30x 21mm, Heavy Duty & High Quality Optical Glass
Magnifer, 10x 25mm Loupe Interchangeable Reticle Scale 0-20mm
Magnifier 7x 21mm Loupe Scale, with Interchangeable Reticle 0-20
Professional Diamond Selector Tester with High Accuracy
Quick Simple Diamond Selector and Diamond / Moissanite Tester
Refractive Index Fluid for Gem Refractometers (2 vials, 2ml/vial
Ruby Filter Gem, identification tool for Emerald & Gemstones