GAIN EXPRESS HOLDINGS LIMITED - industrial Endoscope, PH meter

GAIN EXPRESS HOLDINGS LIMITED

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GAIN EXPRESS HOLDINGS LIMITED

8YRS

Hong Kong

Main Categories

OEM Products

Thickness Meter Gauge

Gem Tools

CO2 , CO , VOC IAQ, Gas Detector

2 in 1 Digital pH and ORP Controller with Output Power Relay Control Water Quality Meter 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)

$17.53 - $20.90/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)

Product Showcase

See all products in showcase

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)

Water quality tester

6-in-1 Pen type Water Quality Meter pH meter Temperature Conductivity ORP TDS SAL Tester Optional ORP (OEM Packaging Available)

$64.10 - $72.90/Set

1 Set(Min. Order)

6 in 1 Professional Multi-parameter Water Quality Monitor Tester pH/ ORP/ EC/ CF/ TDS PPM/ Temperature Combo Testing Meter

$61.20 - $69.90/Piece

1 Piece(Min. Order)

2-in-1 PH & Temperature 0.00~14.00pH degC/ degF Continuous Monitor Meter w/ Backlight Dual Display (OEM Packaging Available)

$17.93 - $20.90/Set

1 Set(Min. Order)

pH / EC / Temperature Meter ATC 3 in 1 Waterproof Combo Multi-Parameter Tester Pool Spa Drinking Purity

$14.90 - $18.90/Piece

1 Piece(Min. Order)

3-in-1 Digital EC / CF / TDS Meter Combo Water Quality Tester IP65 Waterproof Conductivity with ATC Aquarium, Hydroponic

$22.40 - $25.90/Piece

1 Piece(Min. Order)

3-in-1 Checker Salinity & Temp Meter Pen Type Tester ATC NaCl Water Quality Food Pool Cooking Seawater (OEM Packaging Available)

$22.52 - $25.90/Set

1 Set(Min. Order)

Digital pH / ORP mV / Temperature Meter Water Tester Replaceable pH ORP Electrode Detachable Temperature Probe

$56.50 - $63.90/Piece

1 Piece(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)

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 300m/ 980ft Fishfinder Fishing Wireless Operating Range 100m Depth Range Boat Fish Finder (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)

LUCKY Russian Version Wireless Fish Finder Sonar Sensor 45M Digital Design Fish Alarm 120M Wireless (OEM Packaging Available)

$49.00 - $55.90/Set

1 Set(Min. Order)

Jeweller Tools & Equipment

Foldable Chelsea Jadelite Filter for Gem Emerald 20mm diameter Identification tools for Gemstone (OEM Packaging Available)

$12.20 - $14.90/Set

1 Set(Min. Order)

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

$18.50 - $21.90/Piece

1 Piece(Min. Order)

Ruby Filter Gem tool kit Jewelry Identification tool for Emerald & red gemstones gemological tool(OEM packaging available)

$12.20 - $14.90/Set

1 Set(Min. Order)

Diamond Moissanite Tester Gemstone 2pt Jewel Stone Combo Gem Test Jewelry Identifier Tool Equipment

$66.60 - $77.20/Piece

15 Pieces(Min. Order)

Handheld Precise Small Diffraction Spectroscope Gemstone Gem Gemelogy Gemological 55mm Length

$20.50 - $23.90/Piece

1 Piece(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)

NEW Bench Type / Desktop Polariscope Built-in LED Gemstone + 2 Glass Rotatable Filters

$68.00 - $76.90/Piece

1 Piece(Min. Order)

15x 20.5mm Jewelry Loupe Triplet Lens Design Kit Magnification Loupe Black Frame Metal Body Hexagonal (OEM Packaging Available)

$7.10 - $11.90/Set

1 Set(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)