$12.34 – Ethylene Glycol: -50°C-0°C (0–70%), Propylene Glycol: -50°C-0°C(0–70%), Resolution Factor: 5°C / 5% /, (ATC) Temperature Compensation Range: 10°C-30°C.
According to my DB the lowest price is $12.34 for Car Automotive Refractometer (in Banggood). Just check coupons out (with price alert and history). What is best price?
Latest coupon and price update (UTC):
Banggood ($12.34)
Banggood warehouse is located in China. Is it cheap? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $12.02) Well, there is one coupon available right now.
Link: Banggood product page
Price without coupon: $12.99
1. ($12.34): BGMAI666
you should apply the coupon 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/i1u
Old coupons (from the oldest to the newest): BG20236Tool, BGTOOS729
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
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.
Price history and price alert
Do you need price history chart (for all/most countries) for Car Automotive Refractometer? There we go. The lowest price was: $11.04.
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)).