1[Multi Functional] A water quality test pen with four functions in one, which can measure pH, ORP, H2 hydrogen content and temperature value, which is very practical. 2[Efficient And Accurate] This water quality detector has a high performance, pen shaped design to ensure fast testing, stable values, and accurate calculation results. 3[Applicable Scenarios] The water tester is suitable for the detection of hydrogen content in drinking water, aquaculture, swimming pools and scientific research institutions. 4[Detachable Probe] The probe of the test pen adopts a detachable design, which is easy to store, can prevent accidental damage, and is easy to replace the probe by yourself. 5[Good Performance] Automatic shutdown after 5 minutes, more power saving, LCD digital display, easy to observe, with backlight, IP67 waterproof level, very flexible to use.1 x Digital Water Tester3 x Testing Powder1 x English Manual