GAIN EXPRESS best sellers

#1 Jewelers Loupe Magnifier Gain Express Jewelers Loupe Magnifier, Jewelry Loop Magnifier with Light, Hastings Triplet Loupe 10X for Coin, Gem, Stamp, Diamond etc (White LED & UV Light)

$19.90 on Amazon

#2 Thermocouple Thermometer GAIN EXPRESS Thermocouple Thermometer Digital K Type Thermometer HVAC Thermometer Dual Temperature Meter with 4 Thermocouples, MAX/MIN/AVG Temperature Measurement, -50~1300°C (-58~2372°F)

$29.99 on Amazon

#3 🔥 Decibel Meter Sound Level GAIN EXPRESS Decibel Meter Sound Level Meter Professional Sound Level Reader Detector 30dB to 130dB MAX Data Hold, Noise Monitor Digital SPL dB Meter With Alarm, Data Record & Rechargeable Function

$36.90 on Amazon

#4 Durometer Tester Shore Gain Express Durometer Tester Shore A Hardness Tester, Rubber Tire Durometer Gauge 0~100HA Digital Hardness Meter with Large LCD Display

$29.99 on Amazon

#5 🔥 Professional Sound Level GAIN EXPRESS Professional Sound Level Calibrator Decibel Meter Calibrator with Three Calibration Level at 94dB & 104dB & 114dB

$79.79 on Amazon

#6 Digital Tachometer Non GAIN EXPRESS Digital Tachometer Non Contact RPM Meter Laser Photo Tachometer 3~100,000rpm, Contact RPM Tachometer Gauge Speed Meter with Data Hold, Max/Min

$29.90 on Amazon

#7 🔥 Digital 18mm Thickness GAIN EXPRESS Digital 18mm Thickness Window Tint Meter 100% Range Glass Plastic Visual Light Transmission with Sensor

$134 on Amazon

#8 10X Illuminated Jewelers GAIN EXPRESS 10X Illuminated Jewelers Loupe Magnifier with Interchangeable Reticle Scale, LED Light, 25mm Field of View, for Jewelry,Gems, Coins, Hobby Tool

$29.90 on Amazon

#9 CO2 Meter Air Quality GAIN EXPRESS CO2 Meter Air Quality Monitor Handheld CO2 Monitor 0~9999ppm Measurement Carbon Dioxide Temperature Humidity Detector NDIR Sensor Indoor Outdoor Air Quality Tester

$134.90 on Amazon

#10 0 10% Brix Refractometer GAIN EXPRESS 0-10% Brix Refractometer with ATC Low-Concentrated Sugar Content Solutions Accuracy 0.1% Maple Sap Cutting Liquid CNC Maple Syrup Makers Tea

$20.90 on Amazon

#11 Shore D Hardness Tester GAIN EXPRESS Shore D Hardness Tester Meter Portable 0-100HD Digital Durometer D for Rubber, Tire, Plastic, Thermal Plastic, Flooring, Bowling Ball with Large LCD Display

$29.99 on Amazon

#12 🔥 Digital Combo pH & Temperature GAIN EXPRESS Digital Combo pH & Temperature Meter, Aquarium Thermometer pH Monitor with Automatic Calibration Function for Fish Tank Hydroponics Aquaculture Laboratory

$36.90 on Amazon

#13 USB Temperature Data GAIN EXPRESS USB Temperature Data Logger Recorder for Temperature Humidity and Atmospheric Pressure, IP65 Waterproof Temperature Logger with PDF and CSV Reports High Accuracy

$65.90 on Amazon

#14 Clinical Refractometer GAIN EXPRESS Clinical Refractometer with ATC, Tri Scale Serum Protein/Urine Specific Gravity/Refractive Index

$22.90 on Amazon

#15 Automotive Electrical GAIN EXPRESS Automotive Electrical Open&Short Finder Circuit Tester Circuit Finder Detector Tone Generator Cable Wire Breaker Tracker Circuit Fault Finder DC 6-42V Car Diagnostic Tool

$27.90 on Amazon

#16 Professional Sound Level GAIN EXPRESS Professional Sound Level Meter with Backlight Display High Accuracy Measuring 30dB-130dB

$37.90 on Amazon

#17 🔥 Digital LCD Photo Tachometer GAIN EXPRESS Digital LCD Photo Tachometer Non-Contact RPM Meter Speed Gauge Surface Speed Tach Meter

$21.90 on Amazon

#18 Handheld Heavy Duty Calcite GAIN EXPRESS Handheld Heavy Duty Calcite Dichroscope, Trichoic Gem & Gemstones Gemological Testing, Jeweler Tool Metal Body Gemology 15mm Diameter Gemologist

$30.90 on Amazon

#19 🔥 🆕 Digital 4 Channels K GAIN EXPRESS Digital 4 Channels K Type Thermocouple Thermometer with Metal & Bead Probes, Handheld with Backlight, High Temp Meter Tester Multi Measurement Instrument Tool

$26.90 on Amazon

#20 Sound Level Calibrator GAIN EXPRESS Sound Level Calibrator Decibel Meter Sound Level Reader Sonometro Decibel Meter Calibrator 94db & 114db Output Levels For 1 Inch And 1/2 Inch Mic

$109.90 on Amazon