Calibration Solution pH 7.0 - pH Indicator & pH Test Equipment For Hydroponics, Food Processing, Aquariums, Pools, Water - Perfect For Precise pH Meter Calibration Use With pH Probe - 8oz Bottle Atlas Scientific&#039;s pH test solution standardized against <span class="a-text-bold">NIST-certified</span> references, each batch is manufactured under strict conditions to ensure quality and stability and is checked to verify calibration. Wide range of application, Ideal for testing pH balance of drinking water, pool, aquarium, RO system, hydroponics, food processing, home aquariums, industrial processing equipment and pharmaceutical manufacturing. These are the highest quality pH test solutions you can buy on the market today and carry a 2 year shelf life at room temperature. This pH solution is<span class="a-text-bold"> not a dangerous substance</span> according to<span class="a-text-bold"> GHS classification</span> criteria. Each of our pH solutions are <span class="a-text-bold">nontoxic</span> in low quantities. Clean with soap and water if exposed to skin. Avoid ingestion and contact with eyes.