pH Pal Plus Meter The pH PAL tester replaces pH litmus paper. This easy to use instrument does the work of more than 300 rolls of indicator paper. The pH PAL tester is a reliable, robust portable pH tester housed in a water resistant case. The pH tester features an easy to read 6mm LCD display indicating pH over the range of 0 to 14pH with a resolution of 0.1pH and an accuracy of ±0.2pH. The pH Pal's operating temperature range is 0 to +50°C. The pH Pal pocket-sized meter is ideal for measuring pH in many areas including industrial processing, hydroponics, swimming pools etc. specification:range 0 to 14 pHresolution 0.1pHaccuracy ±0.2pHbattery 4 x 1.5 volt button cell (LR44)battery life 200 hoursdisplay 6mm LCDdimensions 15 x 32 x 147mmweight 60 grams The pH pal should be calibrated with 7 pH solution