Aetna Engineering Classic Series digital engine and shaft tachometers are guaranteed accurate to one RPM. These premium quality tachometers take the guesswork out of RPM measurements. Rugged, but precise, they can be used to set exact engine RPMs for most efficient operation.

They provide for effortless synchronization of multiple engines, eliminating the need for a separate synchronizer indicator. All models are permanently calibrated by design. The solid state digital design has no moving parts to stick or wear out.