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YRS
GAIN EXPRESS HOLDINGS LIMITED
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NEW ARRIVALS
Air Quality Meters
Automotive Testing Equipment
Water Quality Meters
Smart Air Detector Analyzer Air Quality Monitor CO2 Meter, TVOC, Humidity, Temperature, PM2.5, PM1.0 W/ Relay Output APP Control
$71.90-79.90
Min. Order: 5 pieces
Fish Finder Wireless Sonar Sensor 45 Meters (147 Feet) / 0.7 Meters (2 Feet) Depth LCD Display 200M Wireless Range for Sea, Ice
$50.53-56.14
Min. Order: 1 piece
Sound Level Meter Datalogger Noise Tester 43,000 Record Capacity Visual Alarm PC Link Color Screen for Home School Noise Monitor
$22.89-25.83
Min. Order: 5 pieces
Factory Direct Sales IP68 Waterproof Underwater Plants Reef Tanks Full Spectrum Light Quantum Par Meter Ppfd
$78.99-95.90
Min. Order: 1 piece
Optical Fiber Identifier Fault Locator 800~1700nm Wavelength Network Testing InGaAs Probe Lightweight Colored Screen Display
$60.20-66.89
Min. Order: 5 pieces
Grain Moisture Meter Water Content Analyzer with 11.81" Metal Probe for 14 Grains Wheat Corn Rice Peanut Soybean
$10.11-12.16
Min. Order: 5 pieces
Digital Air Quality Temperature Meter 4.5M Cable NDIR Sensor Human Plant Mode CO2 Carbon Dioxide Monitor Controller Home Office
$93.90-108.90
Min. Order: 1 set
Professional Digital Thermo-hygrometer Data Logger PDF Excel Report USB Datalogger for Temperature Humidity Barometric Pressure
$43.73-48.58
Min. Order: 5 pieces
CO2 Controller Carbon Dioxide Control CO2 Meter Monitor Day and Night Relay Function NDIR C02 Sensor for Green House Grow Rooms
$90.00-107.90
Min. Order: 1 piece
High Quality New Temperature Recorder NFC Wireless Mode Waterproof IP67 Durable 4000 Storage Temperature Datalogger Food Lab
$6.90-7.90
Min. Order: 60 pieces
Factory Direct Multi-functional Thermo-hygrometer High Quality with Calendar Clock Mini Digital Thermometer for Household Office
$3.90-8.90
Min. Order: 50 pieces
CO2 Controller Greenhouse CO2 Control Grow Tent Carbon Dioxide Sensor Dual Control Function with 15ft Remote C02 Monitor
$92.90-107.90
Min. Order: 1 kilogram
High Quality Tire Pressure and Veins Depth Tool Vehicles LCD Backlight Auto Power Off 3.0 to 99.5PSI 2 in 1 Tire Pressure Gauge
$5.91-7.11
Min. Order: 1 piece
High Quality Durable White Color Tester Measuring Instrument Leucometer 0 to 120 Digital Whiteness Meter Salt Flour Paper Powder
$115.00-140.00
Min. Order: 1 piece
Portable Leucometer 0 to 120 Range Reflectance Meter 254 Data Memory High Quality Digital Whiteness Tool Talcum Powder Ceramic
$89.00-109.00
Min. Order: 1 piece
Digital AC Voltage Frequency Detector Buzzer Automatic Power Off Pocket Size LED Pentype Non-Contact AC Voltage Tester
$2.33-2.88
Min. Order: 5 pieces
Mitech MH600 Portable Leeb Hardness Meter 6 Impact Devices IP65 Metal 170~960HLD Chinese-English Metallic with Carrying Case
$759.30-898.00
Min. Order: 1 piece
Professional Flawmeter Detection 0 to 6000mm NDT Instrument Video Recording Color TFT LCD 7 Probes Digital Ultrasonic Flaw Meter
$2,313.25-2,370.37
Min. Order: 5 pieces
Online PH & EC Conductivity Monitor Meter Tester ATC, Water Quality Real-time Continuous Monitoring, Aquarium, Pond, Hydroponic
$21.05-23.76
Min. Order: 1 piece
BNC Type Connector Replacement Probe 300cm Extra Long Cable 14cm Long 1.2cm Diameter ORP Redox Electrode
$16.16-18.24
Min. Order: 1 piece
6-in-1 Smart Water Quality Meter pH / EC / TDS / Salinity / SG / Temperature with Easy Calibration 24Hrs Online APP Monitoring
$29.76-33.59
Min. Order: 5 pieces
Factory Direct Water Quality Meter Rechargeable Adapter Waterproof BNC Replaceable Electrode Digital PH Monitor for Pool Spa
$20.90-23.90
Min. Order: 5 pieces
OEM Digital Water Quality Inspection with ATC Electrode High Accuracy Factory Calibrated EC Conductivity Meter for Pool Spa
$9.49-9.50
Min. Order: 100 pieces
Low Price Wholesale Handy and Compact Design Water Quality Monitoring Tester 1999 Ppm Digital Pentype TDS Conductivity Meter
$6.60-7.80
Min. Order: 40 pieces
Top picks
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Greenhouse CO2 Controller W/ 4.5 Meters Remote CO2 Sensor Auto Detect Day Night Function Perfect for Grow Rooms, Home, Offices
$93.90-108.90
Min. Order: 1 set
45 sold
Diamond Moissanite Tester Gemstone 2pt Jewel Stone Combo Gem Test Jewelry Identifier Tool Equipment
$73.75-81.94
Min. Order: 2 pieces
5 sold
Portable Compact Sound Level Meters Calibrator 94dB 104dB 114dB Noise Calibration Level for 13.2mm Microphone Size
$48.10-53.44
Min. Order: 1 piece
11 sold
LUCKY FF918-CWLS Color Display Bait Boat Fish Finder with 300m/980ft Wireless Operating Range(OEM Packaging Available)
$99.45-115.90
Min. Order: 1 set
12 sold
CO2 Controller Dual Outlets Control CO2 Regulators and Fans for Grow Room, NDIR Sensor CO2 Monitor and Controller(OEM Available)
$92.90-107.90
Min. Order: 1 set
1 sold
Handheld Precise Small Diffraction Spectroscope Gemstone Gem Gemelogy Gemological 55mm Length
$19.62-22.14
Min. Order: 1 piece
4 sold
Dual Channel Thermocouple Thermometer K/J Probes Temperature Measurement Wired & Stainless Steel Home Appliances to Industrial
$14.70-16.59
Min. Order: 5 pieces
10 sold
WBGT + HI Heat Index Checker Heat Stress Meter Wet Bulb Globe Temperature Humidity Wearable Tester
$18.73-21.14
Min. Order: 1 piece
1 sold
TM-190 Electromagnetic Electric RF Field Strength Tester EMF Meter RF Gauss Meter 20mG with Warning Indicator
$104.62-115.93
Min. Order: 1 piece
13 sold
Digital Lux Meter Light Sensor Tester with Data Logging Function 0-200,000 Lux Range Detachable Sensor for Cinematography, Etc
$22.20-25.06
Min. Order: 5 pieces
10 sold
Top-ranking products
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Pocket Diamond Tester UV Light Gemstone Tool Selector 2pt Stones Compact Design Audible Warning Sound Buzzer With Vinyl Pouch
$29.75-33.57
Min. Order: 2 pieces
2 sold
View details
Water Quality Meters
Chlorine Meters
Conductivity (EC) Meter
Dissolved Oxygen (DO) Meter
Electrode (pH / ORP)
Optional Accessories
ORP Tester / Monitor
pH Meter / Monitor
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Factory Direct Water Quality Meter Rechargeable Adapter Waterproof BNC Replaceable Electrode Digital PH Monitor for Pool Spa
$20.90-23.90
sdf 5 pieces
View details
Factory Big LCD IP67 DO Meter Fluorescent Optical Probe 99 Points Logging Digital Dissolved Oxygen Aquaculture Water Treatment
$189.00-219.00
sdf 10 pieces
Wholesale Filtered Unfiltered Water Monitoring 7 Bright LED IP68 Pre Calibrated Water Quality Conductivity Indicator
$51.50-64.50
sdf 10 pieces
Digital Water Quality Monitor Tester with Separate Relays BNC Type Replaceable Electrode Large LCD PH and ORP Controller
$54.40-60.44
sdf 5 pieces