Necessary to calibrate Ph meters. First adjust your Ph pen to the buffer 7, then to the buffer 4. When it reads correctly in both buffers you know that your Ph pen is reading accurately.
Hydroponic Essentials Ph Buffer
£2.50 – £9.00
Shipping & Delivery
All our products are delivered in unmarked packaging.
Express parcel delivery service
All our products are shipped via DPD with email notifications 1 hour before delivery. Prices are
- Under 2KG - £3.99
- Over 2KG - £7.99
- Free shipping on all orders over £250
Some postcodes within the UK, including but not limited to the Scottish Highlands and Northern Ireland will incur a delivery surcharge, for details please contact us PRIOR to placing an order.