I ve had 2 gas sensors for at least 4 yrs now (orig type) and have been fine. this year I started off with a full 13kg calor and full 11kg gaslow both read empty untill now i couldnt be bothered to find out why, assumed batterys were shot. its not easy to get the bottles in or out of the cupboard, they only fit one way. When i read about the extention lead and AA battery conversion i thought thats for me. So ive got bottles out and converted one to AA and new 2032 in tother. Niether shows anything other than empty when placed on either bottle (there's gas in both, refiled on way home last trip). I even used a second tablet to re-read the devices still no luck. No luck with moving about. i dont have any ultrasonic medium to lubricate the sensors. ANY ideas ?