A mechanic can detect signs, an odometer was opened and thereby possibly tampered with. The other option is to buy a vehicle with a service history. The casa will note the mileage of the car as well as the date, every time they do some work. So even if the car was visiting the casa just only sometimes, the numbers should of course add up. If a car had done 125.000 km, when it was serviced in 2014, it can not suddenly only have done 60.000 km now. The final option is to observe the general condition of the car particularly the interior to check, if it match the mileage.
And needless to say this is something, which is especially important, if you pay extra for a unit, which is supposedly low mileage for its age. Its quite credible that a unit registered first time in 2014 has done only 55.000 km, since this means driving 27.500 km pr. year, which is already a lot. However if a unit sold first time in 2004 has reportedly also done just 55.000 km, thats when you need to see some actual proof, that this number is true.
Back in 2004 I looked at cars from a number of Cebu used car dealers. The only place I found anything with more than 50.000 km on the odometer, was at an importer of used cars from korea. Everything else offered for sale in Cebu had reportedly done less. This was so obvious, that it smelled very fishy indeed. And I ended up buying a unit from a private seller instead, which had a realistic reported mileage of 70.000 km for its age of 6 years, and a fair price.