Echo 8ZH™ is a thick paste couplant that is ideal for flow metering and liquid level sensing. Echo 8ZH maintains its paste like viscosity throughout the operating range of 0 to 800°F for thickness gauging and from 0 to 600°F for long term monitoring . Echo 8ZH is immediately available in 2-oz tubes. Call (360) 510-3503 or e-mail for pricing.