I am the manufacturer of the YM Instrument Co,. Ltd. in China. Suitable for hydroponics, aquatics, pool and spa, waste water treatment, horticultural and agriculture, wherever an accurate measurement of liquid Controller pH is
Required.

YM-201 PH Controller

Accuracy: ±(0.1%+2 Dit)
Resolution: 0.01 pH.
Adjust: PH4 (Slope), pH7 (Cal. )
Setting Range: 3.5 -10.5 pH
Power Cap: 5A/240 VAC.
Power supply: AC110V, AC220V 50/60 Hz.
Power: 2W
Size: 150x85x40mm