Derek, is your tree in a pot or ground? Start by checking soil..Overwatering is the number one killer..if your lime is sitting in muddy dirt, 24/7, the stems/leaves will sag. This also applies to underwatering, but soil would have to be bone-dry, for a long period, before you'd notice the difference. Toni

Hi my tree is in a pot with free flow, i have it in an apartment and the temp is usually 25-30 degrees c in here i keep checking the soil every couple of days with a hydro meter so and it has been reading dry so i water it on average once every 2-4 days

Moisture meters are notoriously inaccurate.

Your plant should be watered thoroughly when it has dried out somewhat from the previous drenching. Each watering should insure that every cubic centimeter has been fully soaked with fresh water, which will then proceed to drain/evaporate/transpire away.

Though we don't know your potting conditions, the size of the plant or the container, the kind of potting medium, etc.....it seems that watering every 2-4 days is a bit excessive. However, if you're giving your plant teeny sips of water, then dry pockets could have formed.

SO! Do you think that your plant is over- or under-watered? Give us some more information, and maybe we can help you decide.

Derek, the temp in your appartment is 30C, which equals 86F...is this correct? Wow, that's hot!!!
Which season is it wherever you're living? If summer, and you (like me) live w/o air conditioning/central air, and temps outside are hot, I can certainly understand, but if it's winter, and your place is heated, not only is it extremely hot, but the air must be super dry..?
Please explain...
I agree with the above poster; you need to check soil by hand, then compare with your watering guage..stick your finger in the soil, insert as deep as possible..does soil feel dry, wet, moist? If it's wet/moist, then there's a problem with your guage, therefore, I'd water according to soils look/feel/weight..on the other hand, if your finger senses dry soil, your guages reading is accurate...
Sagging can happen when plants are overwatered, but heat can cause this problem, too. Toni