I started with that one in a kit for abiiut 100.00. It too was not bulletproof! It o mmly held one reading unless you wired it to a smart phone or tablet/laptop.
I have since moved to Pro Chrono Digital, new one has Bluetooth built in, mine required an adapter to be connected to the chrono (50.00). Think the newer one in cheaper than the old model with adapter. They also will replace or repair ballistic damage at half of retail price.
At Christmas my wife got me a Labradar, pricey but works great from the bench.