supply of digital ph meter etc.digital ph meter etc.,digital ph meter as per technical specification. (quartz annexure a sr.no.1) specification- r ange: 0.00 to 14.00ph/ mv: 0 to +/-1999mv , accuracy:+/- 0.01 ph, +/- 1mv, +/- 1 count, slope adj ustment: 80 to 120 percent at 25 degree c,temperature compensation: manually adjustable s etting on calibrated dial between 0 degree c to 100 degree c, input impedance: >10^12 ohm, electrode connector: bnc type for combined ph electrode, dimension: 180w x 180d x 80mm h, make: toshniwal or deluxe. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]