Motorhome and Trailer Life magazines usually have Harbor Freight coupons that frequently include one for a free digital VOM (Volt Ohm Meter) with any purchase. The coupons are available in other magazines and also in mail fliers. If you get on their mailing list, you can also get them by email. Without a coupon, the meters are less than $6, a great price for what you get.
If you mail order something from them this weekend (2016/04/16-17), the coupon code for the free meter is:
29624057
Phil