Display Type: Digital, Model Number: EZ-9909A, Display: Support backlight, TDS measurement range: 0-1000ppm, Waterproof rating: IP67, Display size: 33*24mm, Weight: 170g, Measuring range of table salinity: 0.00-25.00%, Accuracy: 0.01-5.00% (±0.1%), Battery: 3x 1.5V LR44 Button Battery (not includes), EC measuring range: 0-10000US/cm, Size and weight: 183*37*37mm(7.2*1.5*1.5in)/90g(3.2oz), 5 in 1 function: TDS/EC/PH/Salinity/Temperature Tester, The measurement range of sea water salinity: 10.1-200.0ppt., PH measurement range: 0.01-14.00pH, 5.01-25.00% (±1%).
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Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. There are no active coupons for this product, but the price is pretty low isn’t it? I can’t tell you if this price is good – not enough records in my database, so I won’t judge.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGBG77169, BG8ca8b3, BGherra, BGGines
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – EZ-9909A 5 in 1 TDS/EC/PH/Salinity/Temperature Meter ($-3)
Price history and price alert
There is only one database record (it was for $33.99), so you can’t see price history chart.
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)).