Measuring range:
Dissolved oxygen :(0.0 ~ 20.0)mg/L
Temperature :(0 ~ 40)°C
2. Basic error:
Dissolved oxygen: ±0.01mg/L
Temperature: + 1 ° C
3. Residual current: no more than 0.15mg/L
4. Response time: no more than 30s (90% response at 20°C)
5. Automatic temperature compensation range :(0 ~ 40)°C
6. Power source: no. 7 alkaline battery 4 (portable)
220V power supply (desktop)
**After sales service
*DELIVERY
1. Worldwide shipping(Except some countries and APO/FPO address)
2. The orders will be processed timely after payment verified
3. We only ship to confirmed address, your order address must match your recipient address,
4. We offer different kind of delivery ways, such as China-post airmail, e-packet, DHL and EMS. And other seller's Shipping Method, you can choose the delivery way according to your acceptable freight.
5. If you do not receive your package within 60 days from payment, just contact with us, we will check the shipment for you.
*RETURN & REFUND
- When package arrive, please make sure the outside packing is in well condition, then, you can sign&accept the package.
- You have 7 days to contact us and 30 days to return it from the date you received the package; If this item is in your possession more than 7 days, it is considered used and WE WILL NOTACCEPT YOUR REFUND OR REPLACEMENT
- Defective item should be reported to us and returned to us within warranty period(better in original package). You must tell us what the defect is and the tracking number you send it back
4. Return shipping cost will be prepay by buyer.
5. We normally declare package with Lower Price or As A Gift for custom invoice to save extra taxes, if you have any special requirement about custom invoice, please let us know before shipment out from here
*About us
1. Our aim is Make Every Buyer Satisfied with our products and service
2. We provide both Drop shipping and wholesale, if you are interested in those, contact us freely by leaving a message, or trade manager, visa SKYPE, WE CHAT, WHATSAPP
Our online service time is:
Beijing 8: 30-1230
14: 00-18: 00
Moscow
03: 30-07: 30
09: 00-13: 00
New York 02: 00-06: 00
20: 00-00: 30
London
00: 30-04: 30
06: 00-10: 00
Audited Supplier 
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