General Hydroponics - 1500 PPM Reference Solution 8 oz
General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of PH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians verify that our solutions are exactly calibrated for consistency you can count on.
- 1500ppM (NaCl scale)
- 2190ppM (442 scale)
- 2930 μS (microSiemens)