Featured categories
Best Sellers
Just In
All items
Light Intensity Meter PPFD PAR Tester for Outdoor Indoor Plants Led Grow Lights
$86.90
Professional Multi-Field EMF Detector Meter Electromagnetic Radiation 3-in-1
$159.90
6-IN-1 Water Quality Tester pH/EC/TDS/Salinity/SG/Temp 24Hrs Online Monitoring
$60.90
Diamond Tester UV Ultraviolet Light Gemstone Tool Selector + Pouch JEM-II
$59.90
6X420mm Dental Binocular Loupes Medical Surgical Loupes Dentist Magnifier US
$209.90
Light Meter Portable PAR Meter Quantum For Grow Light Recording LUX Meter Gauge
$139.99
PH & Temperature Monitor Meter 2 IN 1 Dual Display Mini Water Quality Tester kit
$33.89
Lucky Rechargeable Colored LCD Fish Finder Detector 100m (328ft) Wireless Sensor
$120.90
K/J Type Thermocouple Thermometer Temperature Meter Tester Dual Channel 4 Probes
$39.80
30x Magnification Jewelry Gem Loupe with UV & 6 LED Light, 21mm Optical Glass
$23.90
Ruby Filter Gem Emerald Identification Gemstone Red Pink Tester Tool Identifier
$32.90
Wireless Weather Station Temperature Humidity RCC DCF w/ 3 Remote Sensors
$34.90
Wireless Weather Station with 3 Sensors Touch Sreen Humidity Temperature RCC DCF
$34.90
Digital Sound Level Meter Calibrator Professional Noise Decibel Calibration Tool
$129.90
Smart Decibel Meter w/ Large LED Screen Sound Level Meter Noise Monitor 30-130dB
$66.80
LUCKY LCD Fish Finder 980ft Wireless Remote Control Sonar Sensor Fishing Locator
$173.90
Professional Ultrasonic Steel Iron Thickness Meter Gauge Measure 1.2~220mm
$153.90
Decibel Meter Large Colored LED Screen Display Sound Level Tester 30dB to 130dB
$66.90
Replacement Remote Sensor for Wireless Weather Station Temperature Humidity
$23.90
Jewelers Loupe 10X Magnifying Glass with Light Jewelry Eye Loop w/ Reticle Scale
$29.99 to $66.99
Wireless Fish Finder 45m (135ft) Depth & 120m (400ft) for Fresh & Salt Water
$94.90
Gemology Gemstone Gem Refractometer LED Monochromatic Light Filter 1.30 ~ 1.81RI
$92.90
Portable Handheld Polariscope Gems Gemstone Gemologist Tool with LED Flashlight
$41.90
Universal Battery Tester Analyzer C D N AA AAA 9V 1.5V Button Cell Batteries
$9.90
CO2 Carbon Dioxide IAQ Monitor Controller with Relay Function NDIR Sensing Probe
$151.90
Circuit Breaker Finder Electric Tool Receiver Transmitter Fuse Locator 110V
$54.90
2 IN 1 Diamond & MoissaniteTester Gem 2pt Diamond Selector JewelryTest Tool
$119.90
Window Tint Meter Portable Tool Visible Light, UV IR Measure Solar Film Car Tint
$107.99
30x Jeweler Magnification Loupe 20.5mm Gem Magnifier Triplet Lens Optical Tool
$27.90
Chelsea Filter for Gem Identification Emerald Green, Blue and Red Gemstones
$31.90
Professional Sound Level Meter Noise Decible Tester 30dB~130dB High Accuracy
$35.88
Weather Station 2 Wireless Sensors DCF Radio Controlled Clock Thermometer Alarm
$58.90
CO2 Controller & Monitor Auto Detect Day Night Carbon Dioxide with 15ft Remote
$171.90
Swimming Pool pH Meter Chlorine Tester Analog Water Analysis Test Kit
$28.99
3-in-1 Automotive Battery Fluid Antifreeze Refractometer Coolant Freezing Point
$29.90
Industrial 3.5" LCD Video Inspection Endoscope Borescope 1M Cable 3.9mm Camera
$158.90
Digital Sound Level Meter Calibrator Pressure Noise Level Tester Measurement
$119.90
.4.0x Magnification Dental Loupes Prismatic Keplerian Style 40mm Depth of Field
$212.90
K-Type Thermocoupe 4 Channel -200~1370°C /-328~2498°F SD Card Logger Thermometer
$164.90
Scale Loupe Magnifier 10x Magnification LED and UV Illumination Magnifying Glass
$23.90
0-14pH Electrode Probe BNC Connector 300cm Cable for PH Meter Controller Monitor
$19.90
Refractive Index Fluid Oil x 2 Bottles Refractometer RI
$57.90
Window Tint Meter Visual Light Transmission 18mm Thickness Continuous Measuring
$139.90
Smart WiFi CO2 Detector Indoor Air Quality Monitor Carbon Dioxide NDIR Sensor
$79.90
Electronic Digital Inclinometer Bevel Box Gauge Angle Protractor ±180°(0-360°)
$44.90
Digital Sound Level Meter Datalogger A/C/Z Weighted SPL Decibel Meter 30~130 dB
$84.90
K/J Type Contact Thermocouple Thermometer 4-Channel Temperature Tester Max1372°C
$83.90
Bench Type Polariscope Built-in w/ LED, Rotatable Platform 2 poalorized Filters
$130.90
Sale items
About us
Gain Express Holdings Ltd - We are a professional supplier of all kinds of testing instruments based in Hong Kong. We supply a wide range of products w/ CE approval and our factory is certified by EN ISO9001-2000. You can easily find our company's background via search engines. ie. Google or Yahoo