Secchi Disk, Black and White, with 20m Line Flow Meter Because polypropylene does not create

Because polypropylene does not create the same meniscus as glass

• Not intended for professional use - qualitative only

so a little dunking won't deep-six your day

There's also a strong hook and loop strap - for secure and easy mounting to a backpack or harness strap

and other aquatic organisms healthy by providing a continuous supply of oxygen

Secchi Disk, Black and White, with 20m Line Flow Meter Because polypropylene does not createProduct Code: 171 CL Used to determine turbidity or degree of visibility in natural waters. The 20 cm (8) diameter black and white discs come with 3 4 lb lead weights. Includes 20m calibrated line. How to use a Secchi Disk