Return items will be accepted within 40 days when is the date of receiving the goods. Customized items cannot be returned or exchanged. Items bought with an e-gift card are exchangeable only; refunds are not applicable.
Free Gift
Welcome to Roymall, your professional website for purchasing premium department store gifts. We highly value and appreciate your support, and we want to express our gratitude by adding an extra touch of excitement to your purchases. When you shop with us, you not only get to enjoy high-quality products that enhance your lifestyle, but you'll also receive an exclusive free gift with every order you place. Ready to explore our collection and find your perfect gifts? Browse our selection of premium department store items, place your order, and look forward to the excitement of your free gift arriving alongside your purchase.
Shipping Policy
We will work hard to deliver items to you after receiving your orders and make sure they arrive safely. Delivery details will be provided in your confirmation email.In most cases, orders are processed within 2 days.Under special circumstances, it will be delayed as follows: When you place an order on Saturday, Sunday or public holidays, it will be delayed for 2 days..Normally, it needs 5-7 working days (Monday to Friday) without being affected by flight delay or other environmental factors..Because our shipping service is worldwide so the delivery times will depend on your location so it may need a few times and please wait patiently if you are in remote districts or countries.
1. Return & Exchange Policy
We only accept items purchased from roymall.com. If you purchase from our local distributors or other retailers, you cannot return them on our side.Final sales items or free gifts are not acceptable for a return.To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.After receiving return instructions from us, please package up your returned items and drop your package at the local post office or another courier. We will process your return or exchange item within 3-5 working days after we receive it. The refund will be processed and credited automatically to your original method of payment.No returns or exchanges can be accepted if the product was custom produced, including custom size, custom
color, or custom printed.Need more help, please contact us. service@roymall.com or Whatsapp: +447549870296
2.Refund Policy
You'll get a full refund or 100% store credit after we receive the returned package and check it. The refund will be processed and credited automatically to your original method of payment.Please note that shipping costs and any duties or fees are not refundable. The extra shipping costs are non-refundable once the package has been shipped. You are responsible for paying these fees and we’re unable to waive or refund them, even if the order is returned back to us.Once we received and confirmed your returned item, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.If you have any problems regarding the refund process, please contact us. service@roymall.com or Whatsapp: +447549870296
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Specifications:
Working Voltage: DC 5V PCB Size: 83mm x 63mm Air Quality Measurement Range: 10ppm - 999ppm (custom adjustable) Temperature Measurement Range: 0°C ~ 50°C Humidity Measurement Range: 5% ~ 95% RH Voltage Measurement Range: 0 ~ 15V Air Quality Sensor Compatibility: Supports MQ-series sensors for diverse gas detection
Note: This is a DIY kit, you need to assemble and solder.
Features:
1. Multi-Parameter Measurement This versatile kit enables the measurement of air quality, temperature, humidity, and voltage, making it an ideal solution for comprehensive environmental monitoring. 2. Customizable Alarm Thresholds Each parameter can be customized with alarm thresholds. When values exceed the set threshold, an audible buzzer and LED indicator provide real-time warnings. 3. Wide Air Quality Detection Capability Compatible with MQ-series sensors, it detects gases like ammonia, sulfur compounds, and harmful vapors, ensuring flexible adaptation to various monitoring needs. 4. Reliable Environmental Monitoring Temperature and humidity measurements utilize the built-in DHT11 sensor for precise environmental feedback within a broad range of conditions. 5. Compact Design The 83mm x 63mm compact PCB layout saves space, making it suitable for projects with limited installation areas.
Package Included:
1 x Air Quality Temperature Humidity Voltage Detection DIY Kit
Roymall C.o.
Free Gift
Shipping Policy
Return Policy
Coupon Code
Direct purchase from the factory 
Electronic Components & Supplies
DIY Electronic Kits
