The Milwaukee PH600 compact pen tester is specifically designed to help maintain aquariums and aquaculture. Keeping the proper pH improves results for aquarium fish and quality in a range of fish raised in aqulculture. Use digital accuracy to keep pH in your target range for better results.Milwaukee digital pH Pen PH600+ fast, accurate results with digital LCD readout+ easy measurement: just place the probe in the sample, gently stir and wait for the reading to stabilize+ simple one-point calibration with an easy-to-use trimmer located on the back of the pH tester to protect from accidental splashes+ cap to protect the pH sensor and keep it wet when stored upright+ low power demand for extended battery life (batteries included)technical data Milwaukee digital pH Pen PH600pH range: 0.0 to 14.0 pHResolution: 0.1 pHaccuracy: +/- 0.1 pHcalibration: Manual, 1 Pointenvironment: 32F to 122F (0 to 50C) 95% RHdimensions: 32 x 180 x 65 mmWeight: 60 gbattery Type: 3 x 1.5 V Alkaline (included)