Review on Runleader Digital Hour Meter Kit - Accurate LCD Display for Versatile Applications: ZTR Lawn Mower, Tractor, Golf Cart, Marine, ATV, and More! by Daniel Postle

About 3 weeks ago I installed two meters on my 24VAC HVAC system. One controls the heating and the other monitors the cooling time. No problem at 24 VAC voltage level. I use the timer functions to control the runtime of two different filters that I use in the system. The TMR 1 monitors the operating time of the large 20 x 25 x 4 filter in cooling/heating cycles. The TMR 2 timers control the smaller filters used in the exhaust ducts throughout the house. Filters are expensive, so it's good to know the actual run time before changing the filter. August 20, 2020 Update Cooling hour meter error. A constant 0.0 is shown on the display and no response to the 24 VAC input.