Super concentrated - ONE drop per test - approximately 800 tests. pH range 4.0 to 8.0: Many pH testers do not operate below pH 6 (See pH Control). Produces fast pH readings: Note that pH meter electrodes usually need to be left in the sample for several minutes before an accurate/ stable reading is produced. Waterproof colour chart on side of bottle. Perfect back-up for die-hard pH meter users. Supplied with sturdy test tube.
