Tender For supply & installation of water proof-ph meter for bio-toilet lab with technical specifications of 1 iso 9001 -2008 certified auto deluxe ph meter with automatic temperature compensation. 2. includes a combination ph electro de and rtd probe, with a large lcd display. 3. should be useful for ph and redox potential measurements. 4. measurin g range from 0.00 to 14.00. 5. the device should support touch button calibration and should come with a rotational ele ctrode stand. 6. the device must include 3-point calibration along with calibration certificate. [ warranty period: 30 m onths after the date of delivery ]