Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of 
@jesse
Active 4 years, 4 months ago-
Jesse posted a new activity comment 4 years, 4 months ago
Hi Neil,
Thanks for your reply! This sensor is submerged deep in a pool. After I saw that it had a negative reading, I cleaned the outside of the probe, put it back in the water, and took another reading and same thing, negative numbers. Some I’m not sure what to try. -
Jesse posted an update 4 years, 5 months ago
Hi,
I’m excited to be a part of the forum. Let me kick things off with an anomaly! I have a Mayfly with a gauge sensor and I went to go collect the data and clean the probe. When I sat down to look at the data, I was getting negative readings. It was fine and then the depth got lower and lower and then suddenly went negative. Has…[Read more] -
Jesse became a registered member 4 years, 5 months ago
Hello Jesse, great you joined.
Can you need to provide a bit more information.
It is **normal** ~ though perhaps undesirable and non-intuitive ~ for a depth measuring instrument to show a slightly negative depth when outof water. Depending on the type of physical sensor they don’t know 0.0 – they have to be calibrated for it, and even that,…[Read more]
Hi Neil,
Thanks for your reply! This sensor is submerged deep in a pool. After I saw that it had a negative reading, I cleaned the outside of the probe, put it back in the water, and took another reading and same thing, negative numbers. Some I’m not sure what to try.