Digital instruments corporation designs and supplies digital ph meters. Model-505 is one of the model of digital phmeter. These digital phmeters are easy to operate having least number of operating controls. These phmeters have good sleek attractive finish along with good performance at a very economical price. These instruments are best suited for all type of ph electrodes. Following are some of the technical features of these digital ph meters which include: check function saves time from day-to-day buffer setting and hence are the most suitable for quick analysis. The instruments have full range of 0 to 14 ph displayed on 3.5 digital led display. Resolution is 0.01 ph. For potentiometric application, they have a range of 0 to ±1999 mv. High input impedance and stability of reading makes chemical analysis with outstanding precision and repeatability. The digital ph meters are very lightweight made of aluminium cabinet.