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WebJan 30, 2024 · The pH of an aqueous solution is based on the pH scale which typically ranges from 0 to 14 in water (although as discussed below this is not an a formal rule). A … WebBest Selling. Digital Electric PH Meter LCD Tester Pocket Hydroponics Aquarium Water Test Pen. (170) $7.85 New. Hanna GroLine HI9814 Waterproof Portable pH/EC/TDS Meter. … WebAlthough the tachometer alone is able to achieve the above ranges, the master wheel has maximum speed limitation of 5,000 FPM (for safety reasons) MODEL DT-205L R: REVOLUTIONS SINGLE RANGE ACCURACY RESOLUTION Non-Contact RPM 6 - 8,300 ± 1 (rev./min.) 8,300 - 25,000 ± 2 1 (or ±6 RPM max.) herb family