Editorial Review A set of 10 pH Buffer Powder packets. Includes 5 pH 4.00 packets and 5 pH 6.86 packets. These are used to calibrate pH meters, and can also be used to monitor pH levels in aquariums or swimming pools.
Features 1) 10 pH buffer powder packets 2) 5 pH 4.00 packets 3) 5 pH 6.86 packets 4) Used to calibrate pH meters 5) Can be used to help monitor pH levels in aquariums or swimming pool