Check coupons or create price alert down below. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Display Type: Digital, Model Number: EZ-9909A, Weight: 170g, Waterproof rating: IP67, Measuring range of table salinity: 0.00-25.00%, Display: Support backlight, The measurement range of sea water salinity: 10.1-200.0ppt., Battery: 3x 1.5V LR44 Button Battery (not includes), 5 in 1 function: TDS/EC/PH/Salinity/Temperature Tester, 5.01-25.00% (±1%), Accuracy: 0.01-5.00% (±0.1%), Display size: 33*24mm, Size and weight: 183*37*37mm(7.2*1.5*1.5in)/90g(3.2oz), PH measurement range: 0.01-14.00pH, EC measuring range: 0-10000US/cm, TDS measurement range: 0-1000ppm
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($46.76): BGGines
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGBG77169, BG8ca8b3, BGherra
(you can check these old coupons out, but these probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – EZ-9909A 5 in 1 TDS/EC/PH/Salinity/Temperature Meter [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for EZ-9909A 5 in 1 TDS/EC/PH/Salinity/Temperature Meter is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).