Opinions wanted on tire monitors

Three of the batteries in my old system were bad and I figured the other three would go soon. Replacing all six would be as much as replacing the whole system so I bought a new system with replaceable batteries and a flow-thru feature. Also monitors temperature. I like the flow-thru even more than I expected I would. New batteries and "O" rings cost less than $5 each. Should have bought ten monitors instead of six so I'll know if a problem with the towed tires are OK. I plan to add four more monitors.

Can't imagine buying any other system now.