If you want to test your chlorine, fill a 5 gallon bucket with 10 liters of tap water (that's 5 2-liter soda bottles full) You may want to check the FC level of the tap water first. Then add 10ml of bleach to the bucket. Most drug stores sell eyedroppers with a 10ml marking. Mix and test the bucket's FC. It well be the same as the concentration of your bleach, minus, of course, the FC level of the tap water.

Yeah, it's a Jersey thing. We had a less-than-honest contractor give a bad check to the supply house and they came to ME looking for their money--because that's where they delivered his material. He took the money we gave him up front for materials and used it for something else. Later, I Googled him and we learned he had spent a year in jail for taking people's down-payments and...keeping them. He actually completed the job OK, but he knew I was seriously...ticked. And, no, I didn't have to pay the supply house. My GC had wondered why he ALWAYS left his car door open. It became obvious: to make a quick get-away!

BTW, if you ever read Phillip Roth novel "The Plot Against America", he mentions Richie "The Boot" Boiardo, a very real person...his house isn't too far away. I know a coupla guys who knew him when they were kids. Supposedly, the Boiardos were the model for the Sopranos! His grandson is now a respectable orthopedic surgeon.
Sometimes, I wish we had stayed in Virginia!