enough fluids.

I think the simplest indicator that you do not have enough fluid in your body is when you feel thirsty. Another possible indicator is when you skin is dry. I guess the best thing to do is to make sure you just keep drinking water, I don't think you can ever drink too much water, it just goes out again anyway

I think there are some simple ways, to know the body has enough fluids. you do not or rarely feel thirsty. I've read in one article, if the amount of urine you produce during the day, not less than 1.5 liters, and has a translucent color, it means that your body has enough fluids.

I don't know if there is a tool or medical equipment that can gauge if you have enough liquid in your body but I know you can see it in the person;s skin if it is hydrated. Usually dehydrated skin are dry, dull and scaly. We have to drink at least 6 glasses of water daily to maintain healthy skin.

Health books said that we must have at least 8 glasses of water everyday. So, i make it a point to drink at least 8 glasses of water. And to ensure that , i bought a big glass - equivalent to 2 glasses, for the house and for the office. I see to it that i drink one glassful after breakfast, mid morning, lunch, mid afternoon and dinner and even before going to bed.

Sorry my friend if i can't share anything about fluid measurement. But one thing is for sure, I have a problem with hydration. Last time I got fitness assessment, I was told that I need to intake more fluid as there is not enough fluid in my body base on certain normal index according to height or age that I don't know. up till now, I still got problem on hydration. I don't really love drinking fluids. hehehe