Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – EZ-9909A 5 in 1 TDS/EC/PH/Salinity/Temperature Meter [EU] (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (46.76 USD): BGGines
(CouponsFromChina.com tip: just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGBG77169, BG8ca8b3, BGherra
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – EZ-9909A 5 in 1 TDS/EC/PH/Salinity/Temperature Meter [EU] (-3 USD)
Price history and price alert
Do you need price history chart (for all/most countries) for EZ-9909A 5 in 1 TDS/EC/PH/Salinity/Temperature Meter? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).