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SPL Tester https://www.gainexpress.com/products/htm-548 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/HTM-548-Preview_51bef661-657c-479d-ad53-650964c93903.jpg?v=1782572541 HTM-548 Digital Large Screen Hygrometer Temperature and Humidity Measurement with Adjustable Visual/Audible Alarms with External Sensor Indoor Tester https://www.gainexpress.com/products/sqm-545 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/sqm-545-smart-solar-soil-sensor-wireless-conductivity-moisture-temperature-app-monitoring-ip66-waterproof-works-with-android-ios-for-gardens-farms-greenhouses-979.jpg?v=1776738265 SQM-545 Smart Solar Soil Sensor Wireless Conductivity, Moisture, Temperature APP Monitoring IP66 Waterproof Works with Android & iOS for Gardens, Farms, Greenhouses SQM-545 Smart Solar Soil Sensor Wireless Conductivity Moisture Temperature APP Monitoring IP66 Waterproof Works with https://www.gainexpress.com/products/sal-543 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/sal-543-salinity-and-temperature-meter-digital-salinometer-0-199-9-ppt-atc-with-lcd-backlight-high-precision-2-in-1-pen-tester-for-aquarium-fish-pond-marine-353.jpg?v=1776739260 SAL-543 Salinity and Temperature Meter Digital Salinometer 0–199.9 ppt ATC with LCD Backlight, High Precision 2-in-1 Pen Tester for Aquarium, Fish Pond, Marine Tank, and Swimming Pool SAL-543 Salinity and Temperature Meter Digital Salinometer 0–199.9 ppt ATC with LCD Backlight High Precision 2-in-1 Pen https://www.gainexpress.com/products/wqm-546 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/wqm-546-multi-parameter-water-quality-tester-uv-absorbance-for-cod-toc-uv275-ec-tds-salinity-gh-s-g-temp-intelligent-4-color-score-auto-compensation-tap-268.jpg?v=1780280199 WQM-546 Multi-Parameter Water Quality Tester – UV Absorbance for COD / TOC / UV275, EC / TDS / Salinity / GH / S.G. / Temp, Intelligent 4-Color Score, Auto Temp Compensation – for Tap, Purified, Ground, Seawater & Aquaculture WQM-546 Multi-Parameter Water Quality Tester – UV Absorbance for COD/TOC/UV275 EC/TDS/Salinity/GH/S.G./Temp Intelligent https://www.gainexpress.com/products/emf-541 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/emf-541-2000w-solar-panel-tester-mppt-photovoltaic-meter-with-data-storage-full-protection-color-screen-portable-pv-for-testing-installation-maintenance-rf-elf-107.jpg?v=1780278463 EMF-541 2000W Solar Panel Tester MPPT Photovoltaic Meter with Data Storage, Full Protection & Color Screen | Portable PV Panel Tester for Testing, Installation & Maintenance EMF-541 2000W Solar Panel Tester MPPT Photovoltaic Meter with Data Storage Full Protection & Color Screen | Portable PV https://www.gainexpress.com/products/mng-549 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/mng-549-digital-refrigerant-manifold-gauge-set-800psi-hvac-vacuum-pressure-tester-with-holding-leak-test-function-backlight-lcd-display-supports-88-480.jpg?v=1780278171 MNG-549 Digital Refrigerant Manifold Gauge Set, 800PSI HVAC Vacuum Pressure Tester with Pressure Holding Leak Test Function, Backlight LCD Display, Supports 88 Refrigerants for R410A R134A R22 R32 R290 R1234YF MNG-549 Digital Refrigerant Manifold Gauge Set 800PSI HVAC Vacuum Pressure Tester with Pressure Holding Leak Test https://www.gainexpress.com/products/mng-550h 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/mng-550h-digital-high-pressure-single-refrigerant-manifold-gauge-with-leak-test-function-and-control-valve-14-5-800-psi-88-available-refrigerants-for-hvac-auto-985.jpg?v=1780277871 MNG-550H Digital High-Pressure Single Refrigerant Manifold Gauge with Leak Test Function and Control Valve, -14.5-800 psi, 88 Available Refrigerants for HVAC Auto AC Repair Tool MNG-550H Digital High-Pressure Single Refrigerant Manifold Gauge with Leak Test Function and Control Valve -14.5-800 https://www.gainexpress.com/products/mng-550l 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/mng-550l-digital-low-pressure-single-refrigerant-manifold-gauge-with-leak-test-function-and-control-valve-14-5-800psi-88-available-refrigerants-for-hvac-auto-167.jpg?v=1780278031 MNG-550L Digital Low-Pressure Single Refrigerant Manifold Gauge with Leak Test Function and Control Valve, -14.5~800psi, 88 Available Refrigerants for HVAC Auto AC Repair Tool MNG-550L Digital Low-Pressure Single Refrigerant Manifold Gauge with Leak Test Function and Control Valve -14.5~800psi https://www.gainexpress.com/products/wqm-553 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/wqm-553-8-in-1-wifi-tuya-smart-swimming-pool-water-monitor-for-ph-temperature-tds-electrical-conductivity-salinity-chlorine-specific-gravity-orp-spa-tubs-829.jpg?v=1781853999 WQM-553 8-in-1 Wifi Tuya Smart Swimming Pool Water Monitor for pH / Temperature / TDS / Electrical Conductivity / Salinity / Chlorine / Specific Gravity / ORP for Pool, Spa, Tubs WQM-553 8-in-1 Wifi Tuya Smart Swimming Pool Water Monitor for pH / Temperature / TDS / Electrical Conductivity https://www.gainexpress.com/products/aqm-551 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/aqm-551-portable-co2-detector-carbon-dioxide-gas-monitor-0-10000ppm-with-alarm-indicator-7605-data-logging-capacity-color-display-usb-rechargeable-iaq-analyzer-135.jpg?v=1781853920 AQM-551 Portable CO2 Detector Carbon Dioxide Gas Monitor 0~10000ppm with Alarm Indicator, 7605 Data Logging Capacity, Color Display, USB Rechargeable IAQ Analyzer for Petroleum Industry, Metallurgy Laboratory & Scientific Research AQM-551 Portable CO2 Detector Carbon Dioxide Gas Monitor 0~10000ppm with Alarm Indicator 7605 Data Logging Capacity https://www.gainexpress.com/products/gem-552 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/gem-552-10x-magnification-loupe-5-white-and-uv-leds-rechargeable-scale-loop-with-metal-body-detachable-glass-reticle-for-jeweler-watch-repair-coins-stamps-982.jpg?v=1782701852 GEM-552 10X Magnification Loupe 5 White and 5 UV LEDs Rechargeable Scale Loop with Metal Body Detachable Glass Reticle for Jeweler, Watch Repair, Coins, Stamps, Gemstones GEM-552 10X Magnification Loupe 5 White and 5 UV LEDs Rechargeable Scale Loop with Metal Body Detachable Glass Reticle https://www.gainexpress.com/products/msc-555 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/msc-555-handheld-500x-digital-microscope-portable-folding-magnifier-with-auto-focus-8-led-lights-2-0-ips-screen-pc-support-windows-macos-rechargeable-battery-351.jpg?v=1782701747 MSC-555 Handheld 500X Digital Microscope, Portable Folding Magnifier with Auto Focus, 8 LED Lights, 2.0 IPS Screen, PC Support Windows & macOS, Rechargeable Battery with 8GB TF Card for PCB Repair, Textile Inspection, Coin Collecting. etc. MSC-555 Handheld 500X Digital Microscope Portable Folding Magnifier with Auto Focus 8 LED Lights 2.0 IPS Screen PC https://www.gainexpress.com/products/wqm-559 2026-07-22T03:50:37+08:00 daily https://cdn.shopify.com/s/files/1/0393/5153/files/wqm-559-digital-4-in-1-food-ph-tester-pentype-tds-ec-temperature-meter-with-replaceable-probe-atc-backlit-display-for-sourdough-dough-meat-cheese-jam-water-472.jpg?v=1784015923 WQM-559 Digital 4-in-1 Food pH Tester, Pentype pH TDS EC Temperature Meter with Replaceable Probe, ATC, Backlit 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