PH-903A Pen pH Tester ( Water-resistant )
Range: 0.00 - 14.00 pH, Resolution: 0.10 pH, Accuracy: +/- 0.10 pH;
Temp. C: 5-50C, (ATC) Calibration: Two-point at 6.86pH and 4.01pH (or 7.0pH and 4.01pH)
Features: Automatic switch-off function: After 10 minutes without pushing buttons, the meter will be switched off automatically. Low battery: As long as there is any display, the accuracy is guaranteed.
Battery Life: DC 4x 1.5V; Flug: Fixed electrode


PH-903 Pen pH Tester WR ( Water-resistant )
Range: 0.00—14.00 pH, Resolution: 0.01 pH, Accuracy: ≤±0.03pH,
Temp. C: 5—50C, (ATC) Calibration: Two-point at 6.86pH and 4.01pH (or 7.0pH and 4.01pH)
Features: Automatic switch-off function: After 10 minutes without pushing buttons, the meter will be switched off automatically. Low battery: As long as there is any display, the accuracy is guaranteed.
Battery Life: DC 4x 1.5V Flug: Fixed electrode

ZD INSTRUMENT -- SOLUTION FOR YOUR LAB & HYDROPONICS

ZD Instrument Co. (Jiangyan ZhengDa Scientific Education Instrument & Equipment Factory) is a speciallized manufacturer of electro-chemistry instruments. Our main products are pH meters, conductivity meters, "Nutra Wand" conductivity meters, mini TDS meters, salinity meters, Continuous reading PH/Conductivity/Temperatre monitors. pH combined electrodes, skin electrodes, Dissolved Oxygen (DO) electrodes, Conductivity and ORP electrodes. Bearing in our mind that our customers need most reliable instruments, we have always been doing our utmost to supply quality products in our years of history. Most of our products are CE certificated and are sold to all the continents in the world. With the effecient efforts of our R&D team, new products are coming out all the time.