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Air Quality Meters

Automotive Testing Equipment

Gemological Instruments / Jeweler Tools

Refractometers

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New Arrivals

GEM-535 Gem Loupe 10X or 30X Magnification Rechargeable LED Loupe Triplet Lens UV / Warm / Natural / White Light Stainless Steel Magnifier for Jewelry, Watch, Jewelry Inspection

DLG-477 CE Approved IP67 Waterproof 4000 Sets Data NFC Temperature Datalogger Wireless Data Logger Temperature Recorder for Cold Chain

GM1365 Pentype USB Flash Disk Thermometer with Data Recorder Digital Temperature and Humidity Datalogger for Research

PAR-530 Spectroradiometer PPFD Meter Spectrometer PAR Quantum Meter UV IR Light Color Control Analysis Measures 320-800nm from 0~5000μmolm²/s Ideal for Plant Growth, Lab, Home and Industrial Use

MIR-534 Double Sided 1X/10X LED Light Vanity Mirror 9" Rechargeable Make Up Mirror with Adjustable Brightness and 3-Color Change, 360° Rotatable, Touch Screen Design

EMF-528 EMF Meter Tester Electromagnetic Field Radiation Detector EF, Radio Frequency (RF), 3-Axis Magnetic Field (MF) Detection for Home, Office, School, with Audible and Visual Alarm Professional Rechargeable Tester

WQM-527 Smart WIFI Water Quality Monitor Multi-Parameter Aquarium Monitor pH, Temperature, TDS, EC (Conductivity), Salinity, S.G, and ORP for Hydroponics, Aquarium, Fish Tank, Aquaculture

UVM-529 Digital Ultraviolet Detector UV UVI Tester Light Meter Irradiance Intensity Monitor 100 Data Record for Reptile Husbandry, Phototherapy, Indoor Tanning Personal and Professional Usage

MUL-498 Portable Handheld Digital Oscilloscope Voltage, Frequency, Rise Time, Duty Cycle for Professional and DIY Analysis

MUL-523 Digital Clamp Meter AC/DC Multimeter with Voltage Tester, Capacitance, Resistance, Frequency, Duty cycle, Diode Test, Line Connection Test, and Temperature, Non-Contact Current Clamp for Electricians, HVAC, Home Repairs & DIY

THE-263_1TC Infrared Thermometer -50~850°C (-58~1562°F) Temperature Gun with Bead Type Thermocouple & Clamp Type Temperature Probe Non-Contact Laser Temperature Industrial and Home Use Pyrometer for Engine High Temp Measurement Furnace Oven etc.

WQM-526 Digital Water Testing Kit for Hot Tub, Pools & Spas Water Tester Measures pH, Free Chlorine, Total Alkalinity, Bromine, Cyanuric Acid, Total Chlorine, Total Hardness with Water Analyzer and Test Strips

TAC-524 High-Precision Digital Tachometer Non-Contact RPM Laser Tester MAX/MIN/AVG Photoelectric Sensing 10-99999 RPM Range with Reflection Tape Max/Min/AVG Function

GEM-521 10X Magnifying Loupe with LED Light & UV - K9 Lens with 30mm Diameter, Portable Jewelers Loupe for Gemstone, Coin, Stamp, PCB Inspection USB-C Rechargeable

88594 GLP-Compliant K-Type Thermocouple Data Logger: High-Accuracy Temperature Meter (-328°F to 2498°F / -200°C to 1370°C) with 48,000-Point Datalogging, CSV Export & Alarms, Portable/Wall-Mountable, Flexible IR Printing (Optional)

GEM-522 10X Magnifying Scale Loupe White & Purple LED Lights Adjustable Focus Rechargeable Magnifier Glass Lens for Jewelers, Collectors, Hobbyists, and Professionals

MSC-520 500X Digital Microscope with 3.0" IPS Screen, Autofocus, 64GB TF Card Support, Photo and Video with 8 LED Lights – for Windows/Mac Portable Magnifier for Coin, PCB Circuit Repair, Jewelry Inspection, School Laboratory etc.

THE-518 Wireless Solar-Powered Pool Thermometer Floating Thermometer with RGB Lighting IP68 Waterproof Swimming Pool Indoor Temperature and Humidity Measure for Swimming Pools, Spa, Hot Tubs

THE-517 Wireless Solar Pool Thermometer with RGB Lights, IP68 Floating Temperature Gauge for Pools, Hot Tubs, Spa

MUL-508 Portable LCR Meter Tweezer: Resistance/Capacitance/Inductance Tester w/ Diode Test, 100Hz/1kHz/10kHz, Color Display - Compact LCR Bridge

On Sale

7730 Smart CO2 Carbon Dioxide Indoor Air Quality Monitor Temperature Humidity Measurement for Bedroom Close Rooms Offices Classroom

-40%

837-3 Pentype TDS / Salinity / Temperature Tester Water Quality Meter ATC Multiple Units (ppt, ppm, S.G., %, °C, °F) Digital Tool for Saltwater Monitoring & Testing IP65 Waterproof Housing

-10%

AR-166 2-in-1 Electronic Ultrasonic Repeller Anti Mouse & Mosquito 50/ 60Hz, Rats Control, Plug-in Non-Toxic Repellent, Pet & Kids Safe

-40%

E04-004 Brake Fluid Tester Detector w/ LED Indicator & 180° Foldable Testing Rod, Car Auto Automotive Diagnostic Tool Oil Quality Driving Safety Check Analyzer

-40%

E04-007 Digital Auto Range Clamp Multimeter AC DC Voltage Current Tester LCD Display CE Marking

-50%

E04-017 Digital 2-in-1 Car Motor Tire Pressure Gauge Measure + Tire Veins Depth CE Marking LCD Display

-40%

E04-008 Digital Multimeter w/ Test Leads, Overload Protection, DC AC Voltage Resistance Diode Measure DMM Multi Meter Tester 1999 Readings, Backlight

-40%

E04-009 Digital Multimeter 1999 Counts ACV DCV DC Current Diode Battery Tester Meter LCD Display CE Marking

-40%

E04-032 Digital Clamp Meter Multimeter DC AC Voltage Current Resistance Diode Continuity Tester LCD Display

-40%

E04-011_US Automatic Circuit Breaker Finder Tracer AC circuits / Fuses for 100-120V ONLY, LED Signal Receiver Transmitter Fuse Socket ,Plugs, Lighting, Lamp Socket & Outlet Adapters 110V

-20%

E04-014 Digital Clamp Meter DC AC Audible Continuity Tester CE Marking Reading 1999 LCD Backlight

-50%

PHM-443 Digital Pentype pH Meter High Accuracy Colored Screen | Red Backlight Alarm | 3-Point Calibration with Temperature Measurement ATC Function for Liquids in Laboratory Food and Medicine Industry

-20%

PHM-239 PH Meter 360° Flexible Display Angle, 0.00~14.00pH Portable Pocket Size Water Quality Tester Twist & Turnable Monitor Kit Set for Household Drinking Water, Hydroponics Aquariums Pools

-40%

FFW-718 Lucky Portable Wireless Fish Finder Locator with 45m (135ft) Depth & 120m (400ft) Wireless Range, Display Water Temperature/ Fish Size & Location, Fishing Gear Tools for Fresh & Salt water, Ocean, Sea, Lake, River, Ice Icy Water, 90° beam angle

-35%

710-110 / BAT-377 Battery Tester Checker C AA AAA D N 9V 1.5V Button Cell Batteries Clear Bar Graph LCD Display Pocket Size

SQM-256 Soil pH, Moisture & Light Meter 3 Way Tester Kit, Gardening Acidity Probe Test Tool Plants Growth Watering Quality Monitoring Checker for Garden Farm Lawn Household Indoor Outdoor

-50%

WS-104_EU_3S Weather Station Indoor Outdoor Temperature Humidity RCC DCF 3 Wireless Remote Sensors

-55%

868-1 0.0-14.0 pH & Temperature Meter ATC Dual Display, Portable Digital Pen-Type Tester, IP67 Waterproof Dustproof, for Hydroponics Aquariums Drinking Water Quality Control Testing

-40%

AR-111_US 110V Plug-in Ultrasonic Mosquito Repeller, Electronic Non Toxic Repellent, Pet & Kids Safe, Anti Insects Indoor Home Control

-30%

WS-103_2S Weather Station 2 Wireless Sensors, WWVB DCF Radio Controlled Clock Thermometer Alarm, Indoor Outdoor Humidity Temperature Weather Forecast Barometer, Sunrise Sunset Moon Phase

-50%

Best Selling

88594 GLP-Compliant K-Type Thermocouple Data Logger: High-Accuracy Temperature Meter (-328°F to 2498°F / -200°C to 1370°C) with 48,000-Point Datalogging, CSV Export & Alarms, Portable/Wall-Mountable, Flexible IR Printing (Optional)

GM11 Mini 10X Jeweler Loupe Magnifier + LED & UV light, 21mm lens

E-1325M 0-14 pH Electrode Probe BNC Connector, 300cm Cable for PH Meter Monitor Controller Test Sensor, Replacement Kit for Aquarium Hydroponics Plant Pool Spa

E04-036 Automotive Car Repair Diagnostic Tool Cable Circuit Wire Tracker Short Open Finder Tester Checker Device

THE-343 K/J Thermocouple Thermometer Dual Channel Temperature Meter Tester 4 K-Type Probes with Temperature Compensation and Alarm Function

GEM-250 10x Magnification Jewelery Loupe, 20.5mm Triplet Lens Achromatic Optical Glass Metal (Aluminum) Body Black Frame Hexagonal Design Kit Set Jewelry Pocket Magnifying Tool

PAR-355 Light PAR Meter Advanced Quantum Sensor Measure Grow Light Intensity Lux Meter PPFD Tester for Indoor and Outdoor Plant Photosynthetic Activity

GEM-246 10x 21mm Loupe Jeweler Magnifier LED UV Light Triplet Lens Magnifying Gem Optical Tool Achromatic Aplanatic Foldaway Pocket Black Frame for Inspecting Diamonds Gemstones Watches Print

TAC-401 Portable 2-in-1 Tachometer Noncontact Laser Photo Sensor Contact(3~19999RPM) & Non-contact(3~99999RPM) RPM Gauge Tester Professional Handheld Car Engine Tool

SLM-336 Smart Decibel Meter Large Colored LED Screen Display Sound Level Tester 30dB to 130dB Range Temperature Humidity Measurement

PHM-295 2-in-1 Combo pH & Temperature Meter Fish Tank Monitor Thermometer Replaceable BNC pH Electrode for Aquariums Hydroponics Aquaculture Laboratory

SLM-30B Professional Sound Level Meter with Smart Bluetooth Function 20000 Datalogging Max/MIN/Hold Alarm

SLM-441 Decibel Meter Datalogger Sound Level Tester Noise Decibel Reader Monitor SPL Meter with 43,000 Data Record, Visual Alarm, A/C Weighted, PC Connection Colored Screen Display for Home, Classroom, Traffic Noise Monitoring etc.

68022_2P Digital 2 Channels K-Type Thermometer w/ 4 Thermocouples (Wired & Stainless Steel), -50~1300°C (-58~2372°F) Handheld Desktop High Temperature Kelvin Scale Dual Measurement Meter Sensor

MAN-334 Digital Manometer Portable Air Vacuum / Gas Pressure Gauge Meter 12 Measurement Units with Backlight and Data storage Function Sing Pipe or Differential Pressure of 1-2 Pipes Detection

GEM-394 10x Magnification Mini Jewelry Loupe High-quality Hasting Loupe with Optical Glass Triplet Lens, Stainless Steel Body, and Foldaway Pocket Design – Ideal for Stamp & Coin Enthusiasts, Watch Repair, and Hobby Mechanics

THE-373 K/J/T Datalogger Thermocouple Thermometer -200~1372°C (-328~2501°F), 4-Channel Display, Real-Time Data Logging, Audible and Visible Alarm, and ADJ Compensation

560-10A Shore A Digital Hardness Meter Durometer 0~100HA, Rubber Tire with LCD Display Pocket Size Tester

CLMG-7173_LED Magnifier Scale Loupe 10x Magnification 8 LED Light 20mm Scale Chart & 25mm Field of View

PAR-414 Full-Spectrum Quantum PAR Meter Waterproof Sensor IP68 for Aquarium Reef Tank Plants PPFD Tester Indoor Plants, Garden, Farm, Hydroponics Photosynthetic Activity

Our Happy Buyers

I am very excited to try this meter out. It has such an affordable price for a data logging meter. Gain Express Customer Service has been fantastic - very punctual and responsive. Thank you Gain Express!

- Haralambi S.

I purchased some items from Gain Express and they gave me a quick delivery. Thank you very much for your best service.

- BSCS Science Learning

It was really awesome service your company provides, especially your customer care department. They respond very quickly about any query.

- Godin A.

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