Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Product weight: 23.47g(UM24C) 18.83g(UM24), no communication
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
1. ($17.85): BG589b2e
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Old coupons (from the oldest to the newest): tps6786, BGVDay10%off, BGRUMB15, BGAFF10OFF, BGCuponation10, BGHONEY2110, 13f142, BG2589f4, 00c906, BG00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, BG19fa32, Cuponation9
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – RUIDENG UM24 Voltmeter Ammeter ($-3)
Price history and price alert
Do you need price history chart (for all/most countries) for RUIDENG UM24C Voltmeter Ammeter? There we go.
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)).