GAIN EXPRESS HOLDINGS LIMITED

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GAIN EXPRESS HOLDINGS LIMITED

8YRS

Hong Kong

Multi-Language Sites

Product Showcase

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30x Magnification Jewelry Gem Loupe 21mm Optical Glass with UV & 6 LED Light Black Frame Design Metal Body

Online PH/EC Conductivity Monitor Meter Tester ATC Water Quality Rechargeable Real-time Monitoring (OEM Packaging Available)

3 Way Tester Kit (Silver, FREE Gloves) Soil pH, Moisture & Light Meter Gardening Acidity Probe Test Tool

3-in-1 Pentype EC, pH & Temperature Meter 0.01mS/cm Resolution ATC Water Quality Tester (OEM Packaging Available)

Temperature and Humidity measurement with 3 Indoor/ Outdoor Wireless Sensors Weather Station Thermometer and Hygrometer

Digital Carbon Dioxide Temperature Humidity CO2 Monitor WB DP Tester (OEM Packaging Service Available)

Made in Taiwan/Digital 6-in-1 MultiFunction Pentype Water Quality Meter pH Temperature Conductivity TDS Salt Tester optional ORP

Lucky Underwater Fishing Camera Fish Finder Camera with Infrared Lights for Ice,Sea Fishing(OEM packaging service available)

Wall Mount Indoor Air Quality Temperature RH Carbon Dioxide CO2 Monitor Sensor Detector 0~2000ppm Range

Digital Waterproof USB Humidity Temperature and Pressure Data Logger gauge, generate PDF/Excel report(OEM packaging available)

Main Categories

OEM Products

Thickness Meter Gauge

Gem Tools

CO2 , CO , VOC IAQ, Gas Detector

Digital 2 in 1 pH ORP Controller with Output Power Relay Control Water Quality Tester online measure(OEM packaging available)

$75.00 - $84.90/Set

1 Set(Min. Order)

pH / EC / Temperature Meter ATC 3 in 1 Waterproof Combo Multi-Parameter Tester Pool Spa Drinking Purity(OEM packaging available)

$15.90 - $20.50/Set

1 Set(Min. Order)

30x 21mm Optical Glass Jewelry Gem Loupe Magnification UV & 6 LED Light Design Metal Body Black Frame (OEM Packaging Available)

$11.90 - $14.90/Set

1 Set(Min. Order)

Digital Dissolved Oxygen DO Meter Tester 0~199.9% / 0~19.99 PPM / 0~19.99 mg/I Range Thermometer (OEM Packaging Available)

$121.13 - $140.90/Set

1 Set(Min. Order)

Multi-parameter 5-in-1 Water Quality Meter Wall-mountable PH EC CF TDS (ppm) Temperature Tester (OEM Packaging Available)

$50.30 - $56.90/Set

1 Set(Min. Order)

Digital pH Meter Tester w/ ATC Temperature C/F + Free 3 buffer solutions pH4.01 pH7.00 & pH10.01 (OEM Packaging Available)

$19.20 - $22.90/Set

1 Set(Min. Order)

1.2~220mm Dual Ultrasonic Thickness Meter Gauge Velocity Iron Steel Glass Plastics Tester

$107.10 - $124.90/Piece

1 Piece(Min. Order)

Paint Coating Thickness Gauge Meter Built-in F Ferrous / NF Non-Ferrous Probes 0-1250um / 0-50 mil Range

$207.80 - $237.90/Piece

1 Piece(Min. Order)

1000 Micro Unit Digital Paint Coating Thickness Meter Gauge F/NF Probes Magnetic Induction Eddy Current

$144.80 - $167.90/Piece

1 Piece(Min. Order)

Digital CEM Paint Coating Thickness Meter Gauge 1250um (49.2mils) with USB & CD Software F/ NF Probe Sensor for Laboratory

$79.10 - $91.90/Piece

1 Piece(Min. Order)

Fe/ NF Coating Thickness Gauge Tester, 0~1300um 0~51.2mil Attribute Auto Detection & Substrate Paint Inspection Chemical Metal

$55.90 - $63.90/Piece

1 Piece(Min. Order)

Mini Digital Coating Thickness Gauge/ 0~2.0mm Enamel Plastic Epoxy /Car Painting Thickness Tester /Paint Thickness Meter

$13.50 - $16.90/Piece

1 Piece(Min. Order)

NEW Handheld Dark Field 10x Magnification Power Loupe Gem Gemstone Gemology Tester with 18mm Diameter Viewing Lens

$15.00 - $18.90/Piece

1 Piece(Min. Order)

Medium Size, Durable Handheld Diffraction Spectroscope Gemological Tool

$21.20 - $24.90/Piece

1 Piece(Min. Order)

Gem Refractometer w/ Built-in LED Light + RI Oil Gemstone Identifier Tester Jewelry Tool

$62.40 - $70.90/Piece

1 Piece(Min. Order)

30X Jeweler Loupe Magnifier + LED & UV light 21mm lens Jewel Identifier Tool

$12.60 - $15.90/Piece

1 Piece(Min. Order)

20X Magnification Foldable Foldaway Jeweler Loupe Magnifier + 6 LED light + 21mm Triplet Optical Glass Lens

$11.40 - $13.90/Piece

1 Piece(Min. Order)

Pocket Diamond Tester UV Light Gemstone Tool Selector

$29.80 - $34.90/Piece

1 Piece(Min. Order)

Wall Mount Indoor Air Quality Temperature RH Carbon Dioxide CO2 Monitor Sensor Detector 0~2000ppm Range

$99.50 - $115.90/Piece

1 Piece(Min. Order)

Indoor Air Quality 9999ppm Digital Carbon Dioxide Temperature Humidity NDIR Sensor IAQ CO2 Monitor WB DP Tester

$94.40 - $109.90/Piece

1 Piece(Min. Order)

0~2000ppm Range Digital 3-in1 Round Desktop Indoor Air Quality Temperature RH Carbon Dioxide CO2 Monitor Detector

$80.30 - $93.90/Piece

1 Piece(Min. Order)

Digital 6-in-1 Indoor Air Quality IAQ Meter CO2 + CO, Humidity RH%, Temperature, DP, WB, USB Data Logger w/ Software

$244.30 - $278.90/Piece

1 Piece(Min. Order)

Digital Measuring Pressure USB Datalogger Humidity Temperature & Pressure Barometric Data Logger,generate PDF & Excel LED indica

$45.80 - $51.90/Piece

1 Piece(Min. Order)

0~50ppm Air Contaminants Measure Tester for Home Type Indoor Offices Bedrooms VOC Monitor Teste Air Quality IAQ Meter

$62.80 - $70.90/Piece

1 Piece(Min. Order)

pH / EC / Temperature Meter ATC 3 in 1 Waterproof Combo Multi-Parameter Tester Pool Spa Drinking Purity(OEM packaging available)

Watter matters, treat it right!

An easy to use 3-in-1 pentype meter with 0~14pH range that measures the 3 parameters (pH/EC/Temp) in one meter! Comes with protective cap and a hard case.

Water quality tester

Pen Type Salinity & Temperature Meter ATC ppm / ppt / % / S.G. NaCl Water Quality Tester 4 Units w/ Calibration Solution Set

$22.50 - $25.80/Piece

20 Pieces(Min. Order)

3-in-1 Combo Meter Tester ORP Redox PH Temperature Water Quality Aquarium Tank Swimming Pool Lab Spa with Extra Electrode

$35.10 - $40.70/Piece

15 Pieces(Min. Order)

Digital pH / ORP mV / Temperature Meter Water Tester Laboratory Test, Hydroponics Water Testing Tool

$50.10 - $58.00/Piece

15 Pieces(Min. Order)

0-14 pH Electrode Probe BNC Connector for Aquarium Hydroponics Plant Pool Spa 300cm Cable for PH Meter Monitor Controller Test

$7.40 - $8.70/Piece

40 Pieces(Min. Order)

PHM-203 Water monitor Quality Analysis PH & Chlorine Cl2 Level Meter Tester Monitor pH Swimming Pool Spa

$17.20 - $19.90/Piece

1 Piece(Min. Order)

Replaceable Electrode 0.00 - 14.00 pH range/ Digital pH Meter Tester Monitor

$11.70 - $13.90/Piece

40 Pieces(Min. Order)

0.0-14.0 pH & Temperature Meter ATC Dual Display, for Hydroponics Aquariums, Portable Digital Pen-Type Tester, IP67 Waterproof

$17.90 - $20.90/Piece

1 Piece(Min. Order)

Digital Combo pH & TDS Monitor Meter Tester ATC, 0.00~14.00pH & 0.0~199.9ppt for Aquaculture, Salinity, Aquarium, Pond

$33.00 - $37.90/Piece

1 Piece(Min. Order)

Fish Finder

LUCKY Wireless Fish Finder 45M Depth 60M Sonar Sensor w/ Fish Attractive Light Lamp & Color LCD (OEM Packaging Available)

$53.60 - $60.90/Set

1 Set(Min. Order)

Wireless 50M WIFI Sonar 130 FEET (45 Meters) Rechargeable Lithuim Battery IPHONE IPAD IOS Android Fish Finder with Neoprene Bag

$75.80 - $85.90/Piece

1 Piece(Min. Order)

LUCKY RUSSIAN 2-in-1 Fish Finder Waterproof Transducer 328ft / 100m & 180m, Wired/Wireless Sensor (OEM Packaging Available)

$68.00 - $76.90/Set

1 Set(Min. Order)

LUCKY 1.77" TFT LCD Wrist Watch Fish Finder Wireless Sonar Sensor 150FT Depth Fishfinder Clock Mode

$56.20 - $63.90/Piece

1 Piece(Min. Order)

LUCKY FFCW-1108-1 Wireless Fish Finder Sonar Turbid Water Reservoir Sea River lake Boat Kayak Ice Anti-UV LCD Display Fishfinder

$37.40 - $42.90/Piece

1 Piece(Min. Order)

LUCKY FF918-CWLS Color Display Bait Boat Fish Finder with 300m/980ft Wireless Operating Range(OEM Packaging Available)

$93.10 - $107.90/Set

1 Set(Min. Order)

100m (328ft) Wireless Sonar Sensor & 45M (145ft) Depth Coverage LUCKY Fish Finder Colored LCD Fishfinder Detector Waterproof

$68.00 - $76.90/Piece

1 Piece(Min. Order)

FFW-718RU Lucky Portable Digital Wireless Fish Finder with 45m (135ft) Depth & 120m (400ft) Fish Alarm (OEM Packaging Available)

$43.50 - $55.90/Set

1 Set(Min. Order)

Jeweller Tools & Equipment

Magnifier Glass 10x 25mm Jewellers Eye Jewel Jewelry Loupe Reticle Scale 20mm with LED Light

$18.50 - $21.90/Piece

1 Piece(Min. Order)

30x Magnification Jewelry Gem Loupe 21mm Optical Glass with UV & 6 LED Light Black Frame Design Metal Body

$11.90 - $14.90/Piece

1 Piece(Min. Order)

30x Jeweler 20.5mm Gem Loupe Magnifiers Jewelry Triplet Lens Machinists Optical Magnification Coin Mechanics

$6.50 - $9.10/Piece

50 Pieces(Min. Order)

20X Jeweler Loupe Magnifier + LED & UV light 21mm Lens Jewel Identifier Tool

$10.90 - $13.00/Piece

40 Pieces(Min. Order)

Handheld MOISSANITE TESTER Portable Moissanite Tester /Selector + Tester UV Light 2pt Jewel Stone Tool Selector

$29.80 - $34.90/Piece

1 Piece(Min. Order)

Handheld Heavy Duty Calcite Dichroscope, Trichoic Gem & Gemstones Gemological Testing, 15mm Diameter Gemologist

$21.20 - $24.90/Piece

1 Piece(Min. Order)

Portable Desktop LED light for Polariscope / Darkfield Loupe

$7.00 - $8.90/Piece

1 Piece(Min. Order)

Big Prism Spectroscope Gem Gemstone Testing Gemological Tester Identifier Tool

$52.30 - $59.90/Piece

1 Piece(Min. Order)

Air quality monitor

Digital Carbon Dioxide Temperature Humidity CO2 Monitor WB DP Tester (OEM Packaging Service Available)

$94.35 - $109.90/Set

1 Set(Min. Order)

0~50ppm Air Contaminants Measure Tester for Home Type Indoor Offices Bedrooms VOC Monitor Teste Air Quality IAQ Meter

$62.80 - $70.90/Piece

1 Piece(Min. Order)

3-in-1 CO2 Meter 9999ppm Indoor Air Quality Carbon Dioxide Temperature Humidity RH DP WBT IAQ (OEM Packaging Available)

$157.41 - $182.90/Set

1 Set(Min. Order)

Wall Mount Indoor Air Quality Temperature RH Carbon Dioxide CO2 Monitor Sensor Detector 0~2000ppm Range

$99.50 - $115.90/Piece

1 Piece(Min. Order)

Digital 6-in-1 Indoor Air Quality IAQ Meter CO2 + CO, Humidity RH%, Temperature, DP, WB, USB Data Logger w/ Software

$244.30 - $278.90/Piece

1 Piece(Min. Order)

3-in1 Desktop Indoor Air Quality Temperature RH Carbon Dioxide 0~2000ppm Range CO2 Monitor Detector (OEM Packaging Available)

$80.33 - $93.90/Set

1 Set(Min. Order)

Digital Measuring Pressure USB Datalogger Humidity Temperature & Pressure Barometric Data Logger,generate PDF & Excel LED indica

$45.80 - $51.90/Piece

1 Piece(Min. Order)

3-in-1 CO2 Carbon Dioxide Sensor Desktop Indoor Air Quality Data logger Humidity RH 9999ppm Monitor (OEM Packaging Available)

$99.45 - $115.90/Set

1 Set(Min. Order)

Refractometers

Honey Refractometer 3-in-1 Brix/Moisture/Baume Tester Meter ATC 58-90%/12-27%/38-43Be' Tri-Scale (OEM Packaging Available)

$13.60 - $16.90/Set

1 Set(Min. Order)

Beer Brix & Specific Gravity Refractometer with ATC Optic Dual Scale 0~32% Brix 1.000-1.120 SG Fruit Juice Sugar

$10.00 - $12.90/Piece

1 Piece(Min. Order)

Clinical Handheld Refractometer with ATC for Veterinary Dog Cat Pet Human Wrestlers Tri Scale Blood (OEM Packaging Available)

$10.30 - $12.90/Set

1 Set(Min. Order)

Pet Clinical Refractometer Tri-Scale Serum & Plasma Protein Test 2-14g/dl Urine Specific Gravity 1.000-1.060SG w/ ATC

$11.30 - $13.90/Piece

1 Piece(Min. Order)

3-in-1 Automotive Battery Antifreeze Refractometer, Battery Charge Test Cooling System Coolant Freezing Point

$10.30 - $12.90/Piece

1 Piece(Min. Order)

0~80% VOL Alcohol Refractometer w/ ATC Optical Handheld Concentration Tester Meter for Distilled Wine (OEM Packaging Available)

$10.70 - $12.90/Set

1 Set(Min. Order)

6-in-1 Automotive Car Refractometer ATC for Adblue/ Antifreeze/ Battery Acid/ Windshield Fluid Propylene Ethylene Glycol

$10.00 - $12.90/Piece

1 Piece(Min. Order)

Brix Salinity Refractometer 2-in-1 0-32% Brix & 0-28% Salinity Dual Scale Sodium Chloride in Food (OEM Packaging Available)

$10.70 - $12.90/Set

1 Set(Min. Order)

Why Choose Us

Gain Express Holdings Ltd. is specialized in researching and producing high-tech & high quality products at prices & quantity you can afford. We make sure that the product quality meets your standards and the deliveries are on time.

Gain Express is a Hong Kong based company established in 2003. We are a manufacturing and trading company that offers a wide range of electronic products & testing instruments. We have years of trading experience (B2B & B2C) with many customers from North America, South America, Asia, Australia/Oceania, Europe, Africa, the Middle East and so on.

What's more, almost our products have passed European CE certification and ISO9001 quality management system certification.

Our Advantages:

- We offer factory price products
- We accept small quantity & wholesale orders
- We keep our stocks available for anytime order
- We offer the lowest shipping cost via DHL or UPS

Interested? Please feel free to contact us anytime for more information.

Founded in 2004 11 - 50 People 93.5% Quick Response Rate 1,000-3,000 square meters US$1 Million - US$2.5 Million annual output value 1 exhibitions

COMPANY INTRODUCTION

Verification Type:

Manufacturer, Trading Company

Recent Transactions:

Main Products:

industrial Endoscope,PH meter,Refractometer,Fish Finder,Lux Meter,

Accepted Payment Type:

T/T, MoneyGram, Credit Card, PayPal, Western Union

Learn more about us >

Enterprise core competence

R&D Capability

Number of R&D Staff:Less than 5 People

Certifications

Certificates:2

Trade Capability

Trade Staff:3-5 People

Export Percentage:81% - 90%

Production Capability

Production Lines:2

Output Value:US$1 Million - US$2.5 Million

Main Markets

3-Axis Gauss EMF ELF Meter Detector 20/ 200/ 2000 mG & uT for Microwave Computer Line (OEM Packaging Available) $86.70 - $100.90/Set 1 Set(Min. Order)	Tri-Axis Sensor Digital 2000mG Gaussmeter EMF ELF Electro Magnetic Field Gauss Meter Taiwan Made $77.10 - $88.90/Piece 6 Pieces(Min. Order)	Single Cylinder pH Electrode/ plus BNC Long Cable 2 Calibration Solutions 0.00~14.00PH Measuring Range $7.50 - $10.50/Piece 30 Pieces(Min. Order)	Deluxe Digital Light Level Meter/ Tester 200k Lux Foot Candle FC LCD Photo $20.90 - $24.90/Piece 1 Piece(Min. Order)
	3-Axis Gauss EMF ELF Meter Detector, Electromagnetic Field Radiation Intensity 20/ 200/ 2000 mG & uT for Microwave Computer Line $86.70 - $100.90/Piece 1 Piece(Min. Order)		High Resolution Professional RF Signal Meter Tester 0.01Hz~2.4GHz w/BNC Test Leads Radio Frequency Counter $40.20 - $45.90/Piece 1 Piece(Min. Order)

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