Hanna Instruments pH 4.01 Buffer (20 mL sachet) HI70004 TDS The HI981412 uses the HI10063

The HI981412 uses the HI10063 amplified probe that incorporates both pH and temperature sensors and connects to the controller with a single waterproof Quick Connect DIN connector

Can be mixed with all water soluble fertilizers

Can run without electricity

it is simple and affordable for a medium household in the modern city

Hanna Instruments pH 4.01 Buffer (20 mL sachet) HI70004 TDS The HI981412 uses the HI10063HI70004P is a premium quality pH 4. 01 calibration buffer solution. Each sachet has the lot number and expiration date stamped on it and is made of light block foil ensuring freshness each time one is opened. Hannas line of calibration buffers have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened sachet. The HI70004P is for 25 sachets containing 20 mL of buffer. Accuracy of + 0. 01 pH @ 25C