Go down and check coupons out. Remember to check price history if it is available. Best price?
Brand: Tvird, Accuracy: ±0.01 pH, Measuring Range: 0.00 -14.00 pH, Resolution: 0.01 pH, Dimension: 152mm*28mm, Operating Temperature: 0-70℃, Batteries: 2*1.5V (Button cell include)
Aliexpress
I could not find it on Aliexpress. 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 
. This is new product in my database, so I don’t know if this price is good. There is one great coupon!
Link: Banggood product page
1. ($10.79): BGGines
apply it in your cart 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
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BGHB218, BGHID18
(probably won’t work, but you can try them out)
Price history and price alert
Not enough data to show price history chart… $10.79 is the only recorded price. It was not cheaper than that since we have saved it in DB.
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)).