All keen composters and worm farmers should monitor the pH of the their compost and garden soil.
If the compost mix becomes too acid or alkaline the worms and insects breaking down your garden waste will be affected.
If your soil is overly acid or alkaline then it will affect the ability of the plants to extract the nutrients they require - essentially they can become 'locked-up' when ph levels are out of kilter.
Tumbleweed's new pH meter not only measure the pH but also the moisture, temperature and light levels in your garden beds, worm farm or compost bin.