Gain Express

Gain Express Your no. 1 source for electronic products and testing instruments!

Get quick and reliable readings anywhere with this portable salinity and temperature meter, designed for aquariums, pond...
25/06/2026

Get quick and reliable readings anywhere with this portable salinity and temperature meter, designed for aquariums, ponds, pools, and more. Its pen-type design makes it easy to use with just one hand—perfect for both hobbyists and professionals.

Stay confident in your water conditions with accurate, real-time data every time.

✅ 2-in-1 measurement: salinity & temperature
✅ Wide range: 0–199.9 ppt & -50°C to 70°C
✅ LCD display with backlight for low-light use
✅ Automatic temperature compensation for accuracy
✅ Fast response & high precision readings
✅ Switchable °C / °F display
✅ Portable pen-type design for easy handling

Ideal for aquariums, fish ponds, marine tanks, pools, spas, and drinking water testing.

Shop for this item here 👉https://www.gainexpress.com/products/sal-543

Get a complete, real-time understanding of your water quality with this advanced 9-in-1 water quality tester. Designed f...
22/06/2026

Get a complete, real-time understanding of your water quality with this advanced 9-in-1 water quality tester. Designed for accuracy and ease of use, it combines UV absorbance and conductivity measurement to deliver reliable results in seconds.

With a smart color-coded LCD system, you can instantly see your water condition—no guesswork needed.

✅ 9-in-1 testing: COD, TOC, UV275, TDS, EC, salinity, hardness, specific gravity & temperature
✅ Smart quality rating: Excellent, Good, Average, Poor
✅ Intuitive color LCD backlight indicator
✅ High-sensitivity probe for precise readings
✅ Temperature compensation for stable accuracy
✅ Simple one-button operation
✅ Easy calibration & user-friendly design
✅ Compact pen-type form for home or field use

Perfect for drinking water checks, wells, aquariums, and everyday water safety monitoring.

Shop for this item here 👉 https://www.gainexpress.com/products/wqm-546

Take control of your solar PV system with this high-accuracy MPPT Solar Panel Tester, designed for reliable performance ...
18/06/2026

Take control of your solar PV system with this high-accuracy MPPT Solar Panel Tester, designed for reliable performance testing in both field and workshop environments.

With a wide measurement range and real-time LCD display, it gives you clear, accurate insights into your system’s performance—fast and easy.

✅ MPPT high-power measurement up to 2000W
✅ Wide range: 3–90V / 0–40A
✅ Automatic & manual testing modes
✅ Large LCD screen for real-time data
✅ Stores up to 30 test records
✅ Built-in protection: overvoltage, overcurrent, reverse polarity & overtemperature
✅ 1250mAh rechargeable lithium battery
✅ TPR anti-drop, rugged design for field use

Built for durability, safety, and precision—perfect for solar technicians and system installers.

Shop for this item here 👉 https://www.gainexpress.com/products/emf-541

Built for HVAC and auto AC professionals, this 3-in-1 Digital Refrigerant Manifold Gauge delivers precision, reliability...
18/06/2026

Built for HVAC and auto AC professionals, this 3-in-1 Digital Refrigerant Manifold Gauge delivers precision, reliability, and ease of use in every job. Whether you're charging, diagnosing, or testing for leaks, this compact tool has you covered.

Featuring pressure testing, pressure holding leak test, and vacuum measurement modes, it supports a wide range of applications with high accuracy and fast performance.

✅ 3-in-1 functions: Pressure, leak test & vacuum
✅ Supports 88 refrigerants (R410A, R134A, R32, R290, R1234YF & more)
✅ Wide -14.5 to 800 PSI measurement range
✅ Extra large backlit LCD screen
✅ Auto power-off & zeroing function
✅ Universal 1/4" SAE connector
✅ Compact, durable & easy to carry

From refrigerant charging to system diagnostics, this is the reliable tool every technician needs on hand.

Shop for this item here 👉https://www.gainexpress.com/products/mng-549

Skip the bulky equipment and get accurate readings fast with our Digital High-Pressure Single Refrigerant Manifold Gauge...
11/06/2026

Skip the bulky equipment and get accurate readings fast with our Digital High-Pressure Single Refrigerant Manifold Gauge. Designed specifically for measuring refrigerant pressure on the high-pressure (discharge) side, it's the perfect grab-and-go tool for quick system checks, leak testing, and routine HVAC maintenance.

✅ Single-handed operation
✅ Supports 88 refrigerants
✅ Wide pressure range up to 800 PSI
✅ Ball control valve with pressure holding function
✅ Low battery indicator & auto power-off
✅ Compact and easy to carry anywhere

Built for speed, accuracy, and convenience, this digital gauge helps HVAC professionals work smarter and faster on every job.

Shop for this item here 👉 https://www.gainexpress.com/products/mng-550h

Take the guesswork out of refrigeration servicing with our Digital Low-Pressure Single Refrigerant Manifold Gauge. Desig...
09/06/2026

Take the guesswork out of refrigeration servicing with our Digital Low-Pressure Single Refrigerant Manifold Gauge. Designed to measure refrigerant v***r pressure on the low-pressure side and monitor vacuum levels during system evacuation, it helps ensure accurate readings and cleaner, moisture-free lines.

✅ Single-handed operation
✅ Supports 88 refrigerants
✅ Wide pressure range up to 800 PSI
✅ Ball control valve with pressure holding function
✅ Low battery indicator & auto power-off
✅ Compact, lightweight, and easy to carry

Whether you're troubleshooting, charging, or evacuating a system, this reliable digital gauge delivers the accuracy and convenience HVAC professionals need.

Shop for this item here 👉 https://www.gainexpress.com/products/mng-550l

Keep your space pest-free with our Ultrasonic Insect Repellent, designed to help deter insects using high-frequency soun...
30/03/2026

Keep your space pest-free with our Ultrasonic Insect Repellent, designed to help deter insects using high-frequency sound technology. Ideal for homes, offices, and storage areas looking for a cleaner, chemical-free pest control solution. Check this item out here 👉https://www.gainexpress.com/products/ar-131_us

Inspect hard-to-reach areas with ease using our Handheld USB Borescope, designed for clear and detailed visual inspectio...
26/03/2026

Inspect hard-to-reach areas with ease using our Handheld USB Borescope, designed for clear and detailed visual inspections. Ideal for automotive diagnostics, machinery checks, electronics repair, and maintenance work. Shop for this item here 👉 https://www.gainexpress.com/products/c0598am

Ensure accurate moisture and temperature readings in wood, mortar, bricks, and other building materials with our reliabl...
23/03/2026

Ensure accurate moisture and temperature readings in wood, mortar, bricks, and other building materials with our reliable Moisture & Temperature Meter. Perfect for construction, woodworking, and quality control to prevent damage and ensure material integrity. Learn more about this item here 👉https://www.gainexpress.com/products/va-8040

Get precise temperature readings anywhere with our Infrared & Thermocouple Thermometer—fast, accurate, and contact-free....
19/03/2026

Get precise temperature readings anywhere with our Infrared & Thermocouple Thermometer—fast, accurate, and contact-free. Ideal for industrial use, HVAC work, automotive diagnostics, and electronics testing. Check this item out here 👉 https://www.gainexpress.com/products/8090

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Opening Hours

Monday 10:00 - 19:00
Tuesday 09:00 - 19:00
Wednesday 09:30 - 19:00
Thursday 09:00 - 19:00
Friday 09:30 - 19:00
Saturday 09:30 - 18:00

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+85223627800

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