Still with my experience in the hospital laboratory I remember my one event there that was so memorable. When I accidentally break the ph meter well ph meters determine if the media is acidic or basic. What happened was I lose my grip on the device while I was going to the sink. It still worked for few minutes, but eventually it turned off. According to the med techs there is an online store that sells ph meters at affordablephmeters.com from the name of the store I am sure that their products are affordable. This is better than getting a memo from the hospital manager that I damage an apparatus. And, so from that time on I made sure that I am careful in handling all the devices in the lab.