Relative humidity: less than 95%, The maximum dose equivalent rate: 99.99usv / h, Detectable species: Beta Gamma X-ray, Voice Source: Real particle sound / Alarm sound / Mute, Energy Range: 50kev-1.5mev less than 30%, The use of ambient temperature: -25 ~+45℃, Sensitivity: 80cpm / USV / co-60, Power supply: 2x AA rechargeable batteries(NOT included), Relative intrinsic error: less than plus or minus 10%, Sensor Type: GM tube.
Price history, coupons and price alert are available on this page. What is the best price?
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 is no active coupon in my database right now (for Banggood). There’s only 1 record in my database, so I have no idea if the price is OK.
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): 5a0d11, BGTT10, bGhOnEy10, 7d18f7, BGSS10%SW, bgshOOp10, BG11SHOP, 13f142, BGCuponation10
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Not enough data to show price history chart… $57.59 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)).