CHEMSOLUTE Universal pH-indicator paper, pH 1-14, 5m x 7mm, Refill pack with 3 rolls Back Catalog number: 2814-3ROLL Availability: In the manufacturer's stock Price on request - + Recommended MA840 Polarographic DO probe with 3m cable Price on request MA811/2 Conductivity/TDS probe with 2meter cable (MC410). Price on request SE300 Double junction orp platinum electrode SE300 Price on request