The invention is directed to a mobile hand held miniature laboratory system in general, and to fluid testing apparatus for performing a parameter measurement in a fluid sample and methods of use in particular. The apparatus comprising: a strip adapted to absorb a fluid sample and to produce a signal indicative of the parameter level in the sample; and adaptor adapted to connect the strip to a smart phone to allow delivery of the produced signal or a correlated signal to the smart phone for obtaining a measurement of the fluid parameter displayed on the smart phone, wherein the testing apparatus relies on the smart phone at least for power supply and display device. The fluid may be a physiological fluid such as blood, urine, saliva or amniotic fluid, or a non-physiological fluid such as fluid obtained from industrial pools for fish or algae growth, or entertainment swimming pools.